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Title: Seized Piston - Please Help!
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Search Tags: free-up, piston, seized
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bobocan
 Author    



Rank:none
Score: 1
Posts: 1
From: Canada
Registered: 08/29/2009
Time spent: 0 hours

(Date Posted:08/29/2009 11:57:34)

Hello,

I was able to get a hold of a 1974 XL175 from a family member for a great price - free!  However, the piston is seized from sitting, and I can not get it loose.

I have tried soaking it with penetrating fluid etc. (even tried coke as I hear it is a good substitute), and tapping the piston with wood through the spark plug hole, but can not free it up.  I started to take the top end apart to expose the piston, but I see that the cam chain has to be removed from the timing sprocket in order to get it off. 

However, I can't remove the cam chain because I can't reach one of the cam sprocket bolts, without turning the engine over - which I can't do because it is seized - right!

I was going to get into pulling the flywheel to try to loosen off the cam chain, but I don't have a proper puller (the manual says to use only a puller for this)

Any thoughts on what to do next?  I thought of cutting the cam chain worst case scenario...

Thanks,
Beau

orcabee
1# 



From: USA
Registered:05/06/2008
Time spent: 0 hours

RE:Seized Piston - Please Help!
(Date Posted:08/29/2009 12:28:33)

 Damn hard perdicament! If it were me I would let the top end soak for a while......but if is that frozen, some cylinder/piston/ring work will probably have to be done anyway.....

 So, I would probably just snip/ cut/ beak the chain and have a real look-see at the damage and replace the chain after it's all taken care of.

 Also keep a eye on the classifieds for a good bottom......they seem to pop up fairly often, Chuck

--------------------------------------------------------------
always shoot from the hip.........!

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ricortes
2# 



Rank:none
Score:408
Posts:408
Registered:05/01/2004
Time spent: 0 hours

RE:Seized Piston - Please Help!
(Date Posted:08/29/2009 12:59:30)

Absolutely positively the best way to get a piston out is knock the insulator out of a spark plug and braze in a zerk fitting. Fill the cylinder up with water and use a grease gun to ramp up the pressure with the valves closed. The pump on a grease gun is ~same size as one on a bottle jack so you can deliver 10-20 tons of force on the piston.

Rick
orcabee
3# 



From: USA
Registered:05/06/2008
Time spent: 0 hours

RE:Seized Piston - Please Help!
(Date Posted:09/02/2009 19:41:45)


 now that sounds like a super idea.......I think I'd get a bolt with the same thread, cobalt drill it thru longways and tap it to a zerk fitting. Also think I might try hydraulic fluid instead of H2O. , Chuck

--------------------------------------------------------------
always shoot from the hip.........!

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