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| REPLACING VALVES WITHOUT GRINDING SEATS; LOOKING FOR ADVICE | |
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| Tweet Topic Started: Apr 20 2011, 10:22 AM (1,027 Views) | |
| sean bean | Apr 20 2011, 10:22 AM Post #1 |
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New Member
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I have a 1991 geo metro (no egr valve) with bad valves. Most obvious are #3 and #2 exhaust valves. Compression tests #1 cyl 185 lbs. dry 205 lbs wet with 12 percent leakdown test #2 cyl 180 lbs. dry 212 lbs. wet with 28 percent leakdown test and #3 cyl with 154 lbs. dry 162 lbs. wet with 70 percent leakdown test. I plan on buying a head from 3 tech in the future but financially cannot do it right now. What I need advise on is is possible to replace the bad valves with new valves and valve stem seals and lap the new valves to the seats using lapping compound. Can I get a short term valve repair on my head by lapping until I can afford a machine shop do do a proper job? I hope someone who has first hand knowledge might give me somew imput. Thanks for any reply Sean |
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| jellybean | Apr 20 2011, 11:08 AM Post #2 |
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looks like you need to do the rings and hand lap the valves. check the guides also |
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| mcmancuso | Apr 20 2011, 11:24 AM Post #3 |
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lapping valves is fine, I had 1 really burned valve, and a new valve and hand lapping got me going again. Usually the valve seats are OK. I'd highly recommend throughly cleaning the lifters while you've got it apart. read these: http://geometroforum.com/topic/1987137 http://geometroforum.com/topic/638797 http://geometroforum.com/topic/3937058 |
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9:36 AM Jul 11