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savage ray

savage ray

RCTalk Basher
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Location
Port City, NC
RC Driving Style
  1. Bashing
Alright,got the diff put back in and shimmed.While I had the truck down I decided to seal the engine. I have everything put back together and the compression is so high the roto start keeps tripping out. Any suggestions ?
THANKS !!! I put everything back together with the piston at BDC.
 
Does the piston move smooth until it gets into the pinch? If your sure that everything is put together right, heat the engine up with a hairdryer. Get it as warm as you can. You may need to crack the glow plug loose to relieve some compression as well. Just be sure to tighten it up asap once the engine starts. Did you rebuild this engine?
 
Sealing the engine shouldn't have increased compression that much. when you put the engine back together did you make sure to put all the proper head shims in place? Is the glow plug washer in place? Is it a new piston/sleeve that hasn't been fully broken in yet?

If you answered yes-yes-no then consider putting a little after run oil in it just to lube it up until you can get some fuel into it. If it's a new engine, you sometimes have to loosen the glow plug just a touch to relieve some of the compression as you start it. Once it's started you can then tighten it back down. As you break it in, the engine will loosen up and be tons easier to start.
 
No, I did'nt rebuild it. It was never properly sealed so I decided to do it. Everything feels tight. I'll try heating it up and see what happens. Probably didnt listen to enough old school metal while it dried!!! lol

Just pulled the glow plug and it still tripped the roto start. It feels like it is in a bind all the way through the stroke.
 
Uh oh. I have a thought. If it was already broken in when you rebuilt it, did you happen to mark the piston and sleeve so you put them both back in the same direction? I assume the sleeve has an index pin. But if you put the piston in backward it won't turn over very easily. Believe it or not, when you break in the engine, the piston actually moves in a very slight elliptical pattern. So the wear isn't symmetrical. If you turn it 180° it will actually not move well and bind. I suggest being cautious and tearing down that part of the engine again and seeing if turning the piston around helps. Also look to see if you accidentally got some RTV in the crankcase and binding things up.
 
If what candyman says doesn't work out put in a new piston&sleeve. You may have scored it if so its junk. Next time mark it.(THE PROCESS OF LEARNING EDUCATION COSTS$$$$$$$$$$$$$$$$$$$):whhooo:
 
I got it going, I guess it sitting up couple of weeks got it sticky. I put a new plug in it and poured some fuel directly on top of the piston and let set a few minutes, it loosened up and fired rite up.
 

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