Well guys I went out to do some mantice checks on my planes tonight because I had to remove all my batts cause I have sold them since I have made the Switch to wrongways a123 well come to find out it wasnt going to be a very good night.....I pulled the cowl on my Extreme Flight Extra 300 and come to find out there was oil every where... this engine had just came back from a warrenty repair last month and only has been flown one time since its been back they had to change the front bearing.. well come to find out I had a Crack in the rear Crank case.. this isnt the only time this has happened to me it has happend on two other motors also... so after I noticed that i thought I would check out my Yak 54 so I pulled my cowl and guess what this one is starting to crack also... I have bought three of these from Bobby at delta rcengines and one from VA Model Builders the last one that this happended to that I bought from va they replaced the engine.... and that is the engine on the yak and that engine might be 6 months old... now the one on my ef extra it is about 6 months old... Bobby and Simion has alway been good to me....when it comes to warrenty issues but I have to say I am alittle fed up this is the 4th dla engine that has done this to me and I am one that makes sure my prop and my spinner are all balanced very well.... so it cant be from excessive vibration... I will call Bobby and Simion tomorrow.... but I will Email Dla myself tonight... these Engines have always had great power and never had a problem running.... i just think they might need to find a differnt material to make there cranks out of

Looks like they need some different machining at the area where the mounting ear meets the back plate. Looks like a stress crack starts there at a sharp corner and then propogates thru the plate.

Material probably is not the problem. Lack of generous radii around those mounting ears looks to me to be the problem.

Ask DLA if they have a "heavy-duty" back plate with a little more meat on it.

i am on skype with them about it right now

well does not look like the skype is going to well.. they did tell me that they did know they had a problem and that the crankcase material was changed in there newest model but they just want to send me two new recrankcases.. and I have done this before and when I got the new rear crankcase when it was bolted up the crank bottomed out on the crankcase when everthing was bolted up

OK WELL I AM PISSED THEY WANT TO SEND ME REPLACEMENT PARTS FOR MY ENGINES BUT THEY WANT ME TO PAY SHIPPING OK GIVE ME A BREAK LOL I HAVE BOUGHT 5 ENGINES FROM THIS COMPANY I WILL JUST CALL THE USA DEALER TOMORROW MAYBE THEY CAN DO SOMETHING

thought everyone might want to see this


[2/22/2012 10:54:00 PM] blake Brown: Hello
[2/22/2012 10:54:07 PM] feiaomodel: This is Emily, who is that ?
[2/22/2012 10:54:23 PM] blake Brown: I was needing to talk to someone about some problems I have been having out of my dla 56 engines
[2/22/2012 10:54:41 PM] feiaomodel: ok, please tell me what's wrong
[2/22/2012 10:55:04 PM] blake Brown: i have had 4 of these engines they allways run good never hard to tune but they keep breaking Crankcases
[2/22/2012 10:55:27 PM] blake Brown: I have bought 3 from Deltarcengines and 1 from VA modelbuilders
[2/22/2012 10:55:28 PM] feiaomodel: which part? rear or front?
[2/22/2012 10:55:36 PM] blake Brown: rear every time
[2/22/2012 10:55:54 PM] blake Brown: most of the time where the bolt goes thur the Lug to mount to stand off
[2/22/2012 10:56:22 PM] blake Brown: the two engines that have done it this time are only 6 months old
[2/22/2012 10:57:59 PM] feiaomodel: do you have photos ?
[2/22/2012 10:58:11 PM] feiaomodel: show the problems
[2/22/2012 10:58:28 PM] blake Brown: Yes I made a post on flying giants to see if anyother people have had the same problem
[2/22/2012 10:58:42 PM] blake Brown: I have two engines right now with the same problem
[2/22/2012 10:59:02 PM] blake Brown: one just has a hairline crack and the other the case is completely broken
[2/22/2012 10:59:35 PM] blake Brown: https://www.flyinggiants.com/forums/...ad.php?t=71800
[2/22/2012 10:59:39 PM] blake Brown: there is a link to the pictures
[2/22/2012 11:00:33 PM] blake Brown: the engine that has the case completely broken just came back from a warrenty repair the front bearing had to be replaced it had a bad seal
[2/22/2012 11:02:32 PM] feiaomodel: please give me the number of engine, you can find it on cylinder
[2/22/2012 11:02:45 PM] blake Brown: ok i will brb
[2/22/2012 11:02:53 PM] blake Brown: i will give the number to both of them
[2/22/2012 11:03:29 PM] feiaomodel: ok , tks
[2/22/2012 11:06:15 PM] blake Brown: ok
[2/22/2012 11:06:35 PM] blake Brown: 56 101115 448
[2/22/2012 11:06:49 PM] blake Brown: 56101015 291
[2/22/2012 11:09:27 PM] blake Brown: the second engine is just starting the problem it has just started a Hairline Crack
[2/22/2012 11:13:32 PM] feiaomodel: I remember we sent replacement parts to you before, right? now these 2 engines are changed parts?
[2/22/2012 11:15:08 PM] blake Brown: the replacement part wouldnt fit when it came in the Crank Bottomed out on it when the new crankcase was put on so VA Modelbuilders sent me a new engine... and that engine is the one that has the Hairline Crack that is just starting
[2/22/2012 11:16:14 PM] blake Brown: the one that has the case broken in half was bought from Delta Rc Engines it has never had a new case put on it.. that engine just came back from a Warrenty Repair it had to have a new Front Bearing beacause the seal was bad in the bearing from the get go
[2/22/2012 11:19:00 PM] feiaomodel: seal problem? is there oil leak from front bear?
[2/22/2012 11:19:27 PM] blake Brown: there was but that has been fixed it just came back from a warrenty repair from delta rc engines
[2/22/2012 1140 PM] feiaomodel: is there oil leak from front bear?
[2/22/2012 1110 PM] blake Brown: no not now it had a new Front bearing put in it last month i sent it in for a repair
[2/22/2012 11:24:32 PM] feiaomodel: I think this is not seal problem,there are little seal in front bearing, most problem caused by bearing, bearing is damageable.
[2/22/2012 11:24:54 PM] blake Brown: i know this isnt a seal problem
[2/22/2012 11:25:01 PM] blake Brown: the bearing and the seal is fixed
[2/22/2012 11:25:45 PM] blake Brown: My crankcases are cracked and this is the fourth time that I have had this happen on 4 different engines and I am trying to find out why
[2/22/2012 11:25:51 PM] blake Brown: did you not see the picture
[2/22/2012 1128 PM] feiaomodel: I saw the pictures
[2/22/2012 1132 PM] blake Brown: Ok
[2/22/2012 1141 PM] blake Brown: so what can be done and why is this happening
[2/22/2012 1151 PM] blake Brown: I have bought 5 dla engines and have been very happy but 4 of these engines have broken rear crankcases at some time
[2/22/2012 1120 PM] blake Brown: and I have had to send them in to be repaired and that has cost me over 75 dollars in shipping cost
[2/22/2012 1155 PM] feiaomodel: one reasong is old crankcase rear is not stable, we had changed machining, another reasons, one reason is caused by shake
[2/22/2012 1138 PM] blake Brown: ok My props and Spinners are balanced to perfection I spend hrs balancing them to get them as close to perfect as I can
[2/22/2012 1111 PM] feiaomodel: I'm sorry, but I never heard 4 times break in one person
[2/22/2012 1142 PM] blake Brown: it has been on 4 different planes also
[2/22/2012 1148 PM] blake Brown: so what do I need to do
[2/22/2012 11:32:16 PM] blake Brown: You also just said at one time yall knew you had a problem with the old crankcase
[2/22/2012 11:32:31 PM] blake Brown: so has there been a newone made now
[2/22/2012 11:32:50 PM] feiaomodel: we had changed machining
[2/22/2012 1110 PM] blake Brown: ok so the engine numbers I gave you are they the new or old crankcase
[2/22/2012 1152 PM] feiaomodel: they seems old
[2/22/2012 1133 PM] blake Brown: ok one was bought from delta rc engines about 6 months ago and the other was bought from VA Modelbuilders and it is about 6 months old
[2/22/2012 11:35:12 PM] feiaomodel: I see
[2/22/2012 11:35:42 PM] blake Brown: so do they have old stock or what is going on
[2/22/2012 11:38:05 PM] feiaomodel: you brought 6 months ago, they are old, now our engine is new machining
[2/22/2012 11:38:41 PM] blake Brown: ok so these engines are still under warenty
[2/22/2012 11:38:55 PM] feiaomodel: ye
[2/22/2012 1123 PM] blake Brown: but i dont want them replaced with another older model I would like them to be replaced with the newer model because if they are replaced with the older model the same thing will happen
[2/22/2012 11:41:14 PM] feiaomodel: ok, please wait a moment, I'll report this thing, and give you news later.
[2/22/2012 11:41:54 PM] blake Brown: How long do I need to wait...also I know SE Model Engines here in the USA are the same as a dla can they be exchanged with him
[2/22/2012 11:42:52 PM] feiaomodel: 5 minitues, ok?
[2/22/2012 11:43:58 PM] blake Brown: k
[2/22/2012 11:54:44 PM] feiaomodel: hi blake
[2/22/2012 11:55:01 PM] blake Brown: hello
[2/22/2012 11:55:07 PM] feiaomodel: I can offer parts to you directly
[2/22/2012 11:55:19 PM] feiaomodel: 2 rear crankcase, right?
[2/22/2012 11:55:33 PM] blake Brown: I would rather not have to wait for parts to come from china
[2/22/2012 11:55:43 PM] blake Brown: that would take to long
[2/22/2012 11:56:37 PM] feiaomodel: sorry for waiting, this is lunching time, most leader are not in office
[12:00:59 AM] feiaomodel: do you accept these?
[12:01:26 AM] blake Brown: can I not get these engines replaced with the newer models... if you just send me parts I feel that the same thing will happen later down the road
[12:02:00 AM] blake Brown: i have been a loyal customer I have bought 5 dla engines
[12:02:11 AM] feiaomodel: now the problem is rear crankcase
[12:03:12 AM] blake Brown: yes the rear crankcase is the problem
[12:03:54 AM] blake Brown: what has changed on the new engines to keep this from happening
[12:04:05 AM] blake Brown: u said yall had designed a new crankcase
[12:05:08 AM] feiaomodel: we change the material of crankcase and the machining of rear part
[12:05:27 AM] blake Brown: ok so has the front part been changed
[12:06:05 AM] feiaomodel: main change is rear part
[12:06:07 AM] blake Brown: so basicly the whole crankcase material has been change for front and back
[12:06:29 AM] feiaomodel: ye, but there are little problem about front part
[12:07:35 AM] blake Brown: right but I have been though this problem before on the last engine... they sent me just the rear part of the crankcase.. and it wouldnt fit the front part when it was all bolted up the crank would bottom out on the new rear crankcase
[12:09:14 AM] feiaomodel: it's diffcult to change front part by customer
[12:09:22 AM] blake Brown: i under stand
[1210 AM] blake Brown: these motors need sent to warrenty repair or I would rather Exchange them for new ones... I have been a loyal customer I have bought 5 dla engines and in the next month I have to buy another 50cc engine
[1244 AM] blake Brown: should I just call the distributer here in the usa tomorrow
[1237 AM] feiaomodel: how about your idea?
[12:12:05 AM] blake Brown: i am just affraid that if it is just replaced that I will have the same problem later down the road and you have said you knew yall had a problem and yall fixed it in the new model of the engine
[12:13:12 AM] blake Brown: so what about my idea
[12:15:38 AM] blake Brown: you there
[1259 AM] feiaomodel: ye
[12:18:31 AM] feiaomodel: I suggest you change rear parts, it's easy and quickly
[12:19:18 AM] feiaomodel: you said there are not fit, it's only accidental
[12:19:47 AM] blake Brown: I have done that before and it didnt fit will the usa Dealer have the new Design of the rear crankcase instock
[1209 AM] blake Brown: ?
[1226 AM] blake Brown: ok i need to hurry this up i need to go to bed
[12:23:15 AM] feiaomodel: most rear parts can fit frount parts, so I also suggest change parts
[12:24:11 AM] blake Brown: ok i will call the dealers here in the usa tomorrow
[12:24:56 AM] feiaomodel: ok,
[12:24:57 AM] blake Brown: this really isnt fair to me
[12:25:18 AM] feiaomodel: we also can offer parts to you directly
[12:25:24 AM] blake Brown: after these two engines are sent in I have spent over 100 dollars in Shipping cost to get engines repaired
[1242 AM] feiaomodel: ok, but I'm sorry the shipment is not free
[1209 AM] feiaomodel: you need pay shipment, I send new parts to you directly
[1216 AM] blake Brown: yeah but I should have had this problem with 4 engines
[1227 AM] blake Brown: I am not paying for the shipment of the parts these engines are under warrenty
[1246 AM] feiaomodel: we offer free repair and free parts according purchase time, but the shipment is not free
[1247 AM] blake Brown: i will just contact the dealer tomorrow I am not paying for parts to be shipped from china that is very poor customer service I have spent over 1000 bucks with you and have bought 5 dla engines but I will not every buy another one after this

the standoffs complicate things.... they are not torsionally stiff... so they fatigue the mounting tabs...

I would suggest you implement a stiffer mount....

Perhaps a plate that attaches to the motor and then the standoffs mounted to the plate....

good luck with the USA dealer.

Originally Posted by Mithrandir

the standoffs complicate things.... they are not torsionally stiff... so they fatigue the mounting tabs...

I would suggest you implement a stiffer mount....

Perhaps a plate that attaches to the motor and then the standoffs mounted to the plate....

That is exactly what's thought looking at those pics, while the DLA part does look a little weak, those standoff would defiantly transfer flexing stress to the engine case that a better mount wouldn't.

If you have a single failure, it could be just fate, two could be coincidence, but if 4 engines have had the same problem people should look to consider if they have been contributing to the problem.

Blake,

On the one hand I'm sorry to hear of your bad luck, but on the other hand I'm sure glad to have only DLE's & DA's.
aussiesteve could tell us similar horror stories that'd curl our ears.

Sometimes saving a buck on purchase ends up costing waaay more in the end......unfortunately.
Best of luck in getting them fixed right.

Btw/fwiw...If I was you, I'd edit your post#6 and remove your mailing address.....unless ya want to advertise such to the whole web. Just a thought.

Warranty problems for consumers (see us ) in a small market like Australia is a big problem .
If we have a product defect and with NO "Lemon Laws" to back us up we are mostly told
"too bad , you should of read the fine print" . However we have some fantastic engine vendors
down here who do look after their customers . DLE Australia go out of their way to ensure
that all customer issues are seen to ASAP , I think they realise if they dont do the
right thing then we will vote with out feet . In your case it may be time to look to another
dealer who may be more sympathetic to your situation .

With all that being said If I had multipal engines fail in the same manner I would be looking at my mounting method's and the general construction of the given planes .

As for front bearings failing it can happen to the best engines at any given time . Most of these
bearing issues are caused by excessive RPM and over heating .With the general poor
quality of parts they ( DLE and others ) are using the weak points seem to show their heads
pretty early on , as you have found .

Honestly, this stems back to the old saying....you get what you pay for. Get rid of them all and buy some reliable engines like DA, DLE, 3W

Ah 1 hour on a mill and you'd have a new plate made up ..........good as new.

I bought two MTW 35's recently for a Cri Cri I'm building. First thing I noticed was the ignition is unique to that brand and not an RCEXL so that was junked in favor of one I trusted.

The prop bolt holes are laid out in a pattern that don't match anything else on the market. So if I try a few props they are basically garbage if unsuccessful. Easy fix was to machine up two single bolt hub adapters to replace the originals which simplified prop fitting and gave me a little longer engine length for my needs.

The moral of this story is:
Be prepared to modify a component to suit your needs whether it be a high cost item or cheap one and don't expect every off the shelf item to simply bolt on without fuss. This is part of what the hobby is about. Making it work for you.

All my Stan offs are mounted square I have a jig that I drill the the fire wall with they admitted in the conversation that the original case had problems

Thats part of buying cheap engines sometimes.We have to suck it up and move on.With higher prices usually comes better materials and service. Its the nature of the beast. A wise aussie engine man once told me that cheap engines can be made to run like expensive engines if you take the time to tear them down and reseal them.If you pay someone to do that you could just as well have bought higher end.