Hmmm. Maybe that is why the last slant I did a compression check on while it was on an engine stand had low compression!
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| Engine on stand--compression test? https://slantsix.org/forum/viewtopic.php?t=47251 |
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| Author: | Daddiojoe [ Sat Dec 10, 2011 11:04 am ] |
| Post subject: | Engine on stand--compression test? |
So after finally getting a bolt I though I could turn my engine by hand or use and air wrench to get a compression reading. No luck. The engine has been sitting a number of years. Half a not-too-dirty quart of oil low. I was concerned that putting oil in would give an inaccurate reading. Tips? Your expertise is always appreciated, Joe |
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| Author: | emsvitil [ Sat Dec 10, 2011 8:03 pm ] |
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Bolt on the starter and hook up a battery with jumper cables. |
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| Author: | ceej [ Sat Dec 10, 2011 8:20 pm ] |
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It's on an engine stand? CJ |
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| Author: | Fopar [ Sat Dec 10, 2011 8:50 pm ] |
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No way you could spin motor over to get compression test by hand or air impact wrench. you need to have it spinning at starter speed! Richard |
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| Author: | Reed [ Sat Dec 10, 2011 8:50 pm ] |
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Use a thread in compression tester and crank it over by hand so the motor goes through three compression stroke on the cylinder you are checking. Try and rotate the motor so the compression stroke is completed in one continuous crank to avoid too much bleed down. |
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| Author: | SlantSixDan [ Sat Dec 10, 2011 8:52 pm ] |
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You have to be able to crank the engine to do a compression test, which means you need a flywheel and bellhousing. If the engine (and only the engine) is bolted to a stand, there's no way to do the test. And you can't really do a good compression test on an engine on a stand, because the engine's not warmed or warmable up to operating temperature. Easier to pull the head and do a visual inspection. |
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| Author: | Daddiojoe [ Sat Dec 10, 2011 10:20 pm ] |
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Dan--- A link to what I should be looking for? Way to measure ring gap or something like that? Joe |
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| Author: | ceej [ Sat Dec 10, 2011 10:34 pm ] |
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What tools do you have at your disposal? If it's out of the car on a stand, tear it down and use micrometers to determine what condition all parts are in. If it's been sitting that long, it needs new seals anyway. Time to go through it with your machinist and buy a complete engine gasket kit. You can wait to buy that until you find out if you need to kit the engine. If you buy a master engine rebuild kit, the gaskets come with it. If you don't have the tools to go through the engine and make your own measurements, take it to a local machine shop and have it checked out. The rule on ring gap is "3 to 4 per inch of bore." Stock bore is 3.4 so 10 to 14 thousandths. CJ |
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| Author: | Reed [ Sat Dec 10, 2011 10:55 pm ] |
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Hmmm. Maybe that is why the last slant I did a compression check on while it was on an engine stand had low compression!
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| Author: | Charrlie_S [ Sun Dec 11, 2011 4:20 am ] |
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You can do a leak down test on the engine stand. This will give an indication of the condition of the engine. |
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