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| Valves & rings ? https://slantsix.org/forum/viewtopic.php?t=43964 |
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| Author: | frcc [ Wed Mar 09, 2011 7:09 pm ] |
| Post subject: | Valves & rings ? |
Got a 72 B-300/6 Engine runs rough with no power. Got approximately 1 115-120 2 115-120 3 85 -85 4 115-120 5 105-115 6 115-120 after 3 or 4 revolutions with throttle and choke open. engine burns no oil and does not smoke. I have a point system and am checking it out now. Carburetor is a one bbl 1920 (i think) QUESTION with these comp numbers, should i be looking at a rebuild or just a good vlv job. Engine was rebuilt several yrs ago but details and components unknown. Have had to replace a couple of valves in the past as they were deformed and burnt. thanks in advance |
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| Author: | ceej [ Wed Mar 09, 2011 7:24 pm ] |
| Post subject: | |
Check valve lash on cylinder #3 first. If that's good, it looks like a valve on #3 is your problem. Your numbers are dry-wet, correct? CJ |
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| Author: | frcc [ Wed Mar 09, 2011 7:26 pm ] |
| Post subject: | rebuild or valves |
thanks cj yep, checked lash today and found no tight valves. Adjusted all intake and exh what do you pros use to determine if rings need replacing? I have placed oil in the cylinders and the effect was small during comp testing |
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| Author: | frcc [ Wed Mar 09, 2011 7:33 pm ] |
| Post subject: | rebuild or valves |
no didn't check wet today the variations was just when i check them more than once. Will check dry and wet tomorrow and post. How much diff would indicate rings? Or, how much diff should there be? |
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| Author: | DusterIdiot [ Wed Mar 09, 2011 8:04 pm ] |
| Post subject: | Some difference... |
Quote: Will check dry and wet tomorrow and post. How much diff would indicate rings? Or, how much diff should there be?
The compression check number would be a night and day difference (I've seen a 10psi cylinder go to 45 on the wet check...LOL)...The next step would be a leakdown test that would determine if it was cylinder/valves/gasket (all of the above). -D.Idiot |
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| Author: | frcc [ Wed Mar 09, 2011 8:21 pm ] |
| Post subject: | valves and rings? |
forgot to mention oil pressure is 50-60 lbs at warm idle. will also do leak down tomorrow as well as wet comp, that should tell me whats wrong i guess. |
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