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ENYA .35  rod Babe_b10
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ENYA .35  rod Empty

ENYA .35 rod

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ENYA .35  rod Empty ENYA .35 rod

Post  OhBee on Sat Mar 28, 2020 5:47 pm

Is the wist pin supposed to be free to rotate in the small end of the rod...or does it rotate only in the piston itself?......which goes against the functioning of any internal combustion engine I've worked on in 45 yrs.!.....do I have a stuck wrist pin?   Feels weird at the top of its stroke and has a lot of slop between TDC and starting its downstroke. Been totally disassembled and rod itself has no slop.
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ENYA .35  rod Empty Re: ENYA .35 rod

Post  Dave P. on Sat Mar 28, 2020 6:33 pm

The wrist pin should be free in the rod end, sometimes tight in the piston. Never the reverse.
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Post  OhBee on Sat Mar 28, 2020 10:24 pm

Thats what I thought. Bummer....now what?
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Post  Cribbs74 on Sat Mar 28, 2020 10:34 pm

Take it apart.

Should be pretty easy if you have been working on engines 45yrs Wink

Usually the rod is just castor stuck to the piston pin, some folks just pull the backplate off and spray the rod/pin with brake cleaner and work the rod back and forth with an allen key.

I personally prefer to take it apart and clean everything. Even at that you may still have to free the rod from the piston pin before you can slip It off the crank pin.

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Post  NEW222 on Sun Mar 29, 2020 12:45 am

When taking it apart, or trying to free it up, heat will be your friend if castor stuck, and which most likely it is.
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ENYA .35  rod Empty Re: ENYA .35 rod

Post  OhBee on Sun Mar 29, 2020 2:29 am

Ya....it was BAD castor stuck! Had to remove front of crankcase and crank and push piston out the top. Could move wrist pin out of piston far enough to get ahold of ,and between carb and choke cleaner,blaster,and a cranked up bic lighter on the small end of the rod I finally got it moving. Took several heating attempts to finaly get rod off wrist pin! Cleaned up,lubed up and back together. Was a bit of a trick getting piston back down bore. Tight tapered fit apparantly! Now I wonder if my other 2 have the same issue?
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Post  Oldenginerod on Sun Mar 29, 2020 4:34 am

OhBee wrote:Ya....it was BAD castor stuck! Had to remove front of crankcase and crank and push piston out the top. Could move wrist pin out of piston far enough to get ahold of ,and between  carb and choke cleaner,blaster,and a cranked up bic lighter on the small end of the rod I finally got it moving. Took several heating attempts to finaly get rod off wrist pin! Cleaned up,lubed up and back together. Was a bit of a trick getting piston back down bore. Tight tapered fit apparantly!  Now I wonder if my other 2 have the same issue?
I'm assuming this engine has a baffled piston, so just be sure to install the piston the corect way around. (You probably already know that!!)

Actually, many automotive wrist pins are a press fit in the rod and run free in the piston.  You see them both ways, but I'm not sure of the advantages. In my experience with Enya, the pins have always been fully floating.
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Post  OhBee on Sun Mar 29, 2020 1:14 pm

Yes ,i know older cast iron block car engines were mostly press fit rods. But not the smaller 4 and 6 cylinder newer stuff. All of my previous model engine experience is Cox products.
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ENYA .35  rod Empty enya and os chare same part

Post  davidll1984 on Tue Mar 31, 2020 8:24 pm

wat model .35 y modyfied enya wit os parts wirst pin must have plastic retainer like to prevent wrist pin to move on sleve an marc deap ling in sleve it supose to moove free wen litle plastique part not instal my frankstein enya .35 was made for control ling aded tuned pipe from os 40 carbu from os marine.32 sleve from os .35 piston con rod dont remember exact timing end part used remember try 3 tipe of heed befor finding good 1 engine rev 33000 rpm statick insane sound its scary use a .60 dint scared me to fly .35 is my best result ever 1 of fastes is in a sukoi made for 480 brushless wil sur fly 1 day egain
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