Top end rebuild, advice needed?
Posted September 30, 2005 - 01:08 PM
If i need a new piston kit/rebore or do these parts look ok to put back in? I don't see any score marks or gouges on the cylinder but there does appear to be a "shadow" at TDC, now whether this is more than just a shadow is yet to be confirmed when i have a closer inspection of it tomorrow, i was late finishing in the garage so by the time I'd stripped it, i had time to take some pics and then had to get cleaned up, (the missus can be a pain at times!).
Anyway, it looks to me like the bore is relatively ok as i can still see the honing marks and since they are not "polished" off, i am presuming that it is still in fairly good condition and does not need a rebore, am i correct in thinking this? This being my first ever strip of a WR I'm learning as i go along, but i know from having built several Car engines in the past, honing marks on the bore was a good thing when rebuilding as it help "bed" the rings. What do you guys think? should i just put it all back together and hope the "hissing" sound (like escaping gases when on compression) is either a faulty head gasket (but no oil in the water or bubbling?) or i have a burnt valve (my first conclusion?) as i say, this problem is explained elsewhere on the forums http://www.thumperta...ad.php?t=295184 because i was concerned when doin my valve re-shim how i could go past TDC without having to use the de-compression lever when on the compression stroke indicating an air leak of some description?
One more thing. there appears to be "burn" marks on the crank (see pic) http://www.strangler...co.uk/Crank.jpg
Has anyone got ideas about these and what would cause that?
last thing, what is the best way to check the piston/bore/pin etc to see if they are ok to go back in as they are? A compression ring in the cylinder at different intervals to check gap, or is there a better way? feelers down the side of the piston (minus rings) while it is in the bore? haven't come across any of this info in the manual, unless I've missed it?
Obviously I'd like to go "The Full Monty" and have a 444cc kit and auto-cam, but for now as finances are very low I'd like to get her fixed for minimal cost if at all possible?
Anyone got any tips for a dropped circlip down below the crank? i hope it's on the floor somewhere and not down there in the darkest depths of "cogland"? I'd hate to think my "top end overhaul" turned out to be a complete stripdown!
Thanks for any help and advice guys, great source of info these forums
Posted September 30, 2005 - 03:30 PM
Get a long handled magnet and a flashlight to get the circlip out.
Posted September 30, 2005 - 05:09 PM
Posted October 17, 2005 - 03:20 PM
Posted October 17, 2005 - 04:02 PM
The head and valves should be rebuilt or replaced for sure. It is time.