|
gshadel
12-11-2007 08:33:54
|
|
Re: TO-30 Compression in reply to Jim in TN, 12-10-2007 20:11:50
|
|
| |
Jim, low compression after adding oil to the cylinder is typically indicative of poor valve seal, or blown head gasket. Poor valve seal can be burned/worn valves, sticking valves, build-up, or a seriously out of adjust problem. The least effort, 1st check is to pull the gas tank, valve cover, and check/adjust the tappet clearance on valves for # 4, may as well check-em all while your there. Watch your valve motion thru a couple turns of the crank to make sure they are not sticking. If that does not improve your compression, your next step would be to pull the head to clean/inspect/replace your # 4 valves & possibly lap/polish the valve ports on the head if needed. You will need a new head gasket if you pull the head. With a service manual it is not a difficult job to do all that, the only "special tool" you would probably need is a valve spring compressor so you can safely remove your valve springs. You can often borrow those, or rent for free from your local auto parts chain store, or make something of your own with a bent screwdriver. If you pull your head, a typical machine shop will charge you ~$70-80 to check your head for warp, clean, check for cracks, and grind/polish your valve ports, that is after you have stripped down the valves, springs, etc. off the head. Well worth the expense & piece of mind. George
|
|
|
