80 tk

[MR Misfit]

need a little help  from the TK guys

[Vintagesleds.com]

[indy8six]

Hard to answer if you don't ask a detailed question. I have had at least 10 TK's, what do you need to know?

[MR Misfit]

ok father in law sled blew up  i need to know the crank seals  any help

[ddub]

ok father in law sled blew up  i need to know the crank seals  any help

they are readily available.  JLO/Cuyunna.  You need to know which engine.  TK's would have been 340/440

[MR Misfit]

440 six bolt

[SCORPION TKX]

There could be a few causes for smoking the engine. Could be the timing is too advanced, Could have gotten too hot. does this tk have the cold air kit installed. Or could be the crank seal on the clutch side. The cuyuna engine 9 out of 10 times blows the clutch side piston.

[Skiwizzer]

Uses the same ribbed seal as the AC engines on the PTO side. Many suppliers list the smooth OD seal for the JLO/Rockwell which is incorrect and comes in the Wonderosa gasket kit. 30mmx62mmx8mm ribbed seal if my memory is good. I just blew a hole in the PTO cylinder yesterday on one of those . I do have a spare engine ready to assemble except for the PTO seal 

[MR Misfit]

thanks it does have the cool air intake and exaust system took the head off the clutch side pistion is tosted i took a light and cant see any thing wrong with the seal the two other motors i have a round thing by the motor on the clutch side the one that blew up today dont any idea what it is

[Skiwizzer]

thanks it does have the cool air intake and exaust system took the head off the clutch side pistion is tosted i took a light and cant see any thing wrong with the seal the two other motors i have a round thing by the motor on the clutch side the one that blew up today dont any idea what it is

A picture of the round thing would help but it could be the electric start ring gear. Visual inspection isn't very helpful. The seal allows air to be sucked in and leans out the mixture and burns the piston. Mine burned down due to the black single use case studs failing on the PTO cylinder and blowing the base gasket. The engine was running rich and even on both cylinders last week. The PTO cylinder nuts were down to finger tight by the clutch.

[MR Misfit]

i would have to take the cluch off it looks like it on the block the one that blew up dont have it on it

[MR Misfit]

top

[Skiwizzer]

the later engines used a longer PTO crank bearing and have a round extension cast into the block. The flat blocks use the same bearing as the old LR series and are a little on the weak side. Common failure mode is to wear out the PTO bearing which causes the seal to fail and then causes the PTO cylinder to burn down. Replace the PTO bearing when you redo that engine. kind of explains JLO/Rockwell/Cuyuna's reputation for burning PTO pistons if you look at them sideways.

[MR Misfit]

thanks will do