2nd Generation Specific 1986-1992 Discussion

Compression: 0-0-0 Psi -> Need Help

Old 02-21-2004, 01:05 PM
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Yesterday I did some shopping for a jspec engine. I tested compression on about 5 or 6 engines and there was no ones that had more than 60 psi. I guess something is wrong. I know that jspec engine are not always in good shape, but I think it's impossible there was not at least one good. Maybe I didn't did the compression test right. I put some oil in the engine, WOT, cranked with the starter. I tried with 2 different testers (not mazda tester) with removed check valve.



I tested a 13B-re which I'm very interested in and it had 0-0-0 on read rotor. When I say 0, it's 0 the needle didn't move at all. I said to myself, maybe the seals are just stuck... What do you think ? Is it possible ?



Thanks for help!
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Old 02-21-2004, 01:08 PM
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If you put oil in the engine while cranking that raises compression . You are suppose to have the engine dry. 0-0-0 sounds like the seals are gone and the rear housing is probably trashed, along with the rotor too. Take off the exhaust manifold and look inside the exhaust ports. Turn the engine with a rachet and look at the apex seals to verify if they are still there.
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Old 02-21-2004, 01:25 PM
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stuck is possible but unlikely. if its 0-0-0 then you should consider it a rebuild core
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Old 02-21-2004, 03:29 PM
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Originally Posted by 1Revvin7' date='Feb 21 2004, 11:08 AM
If you put oil in the engine while cranking that raises compression . You are suppose to have the engine dry. 0-0-0 sounds like the seals are gone and the rear housing is probably trashed, along with the rotor too. Take off the exhaust manifold and look inside the exhaust ports. Turn the engine with a rachet and look at the apex seals to verify if they are still there.
Is it possible to look inside the spark plug hole instead and check with a screw driver if the apex seals still on the rotor ?



It would be least complicated than removed the twins and the exhaust manifold.



Thanks guys!
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Old 02-21-2004, 06:17 PM
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Originally Posted by FD3S_wanted' date='Feb 21 2004, 04:29 PM
Is it possible to look inside the spark plug hole instead and check with a screw driver if the apex seals still on the rotor ?



It would be least complicated than removed the twins and the exhaust manifold.



Thanks guys!
I suppose but you can't see cracks or missing chucks of the apex seal where the spark plug hole doesn't allow you to see...
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Old 02-21-2004, 07:12 PM
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Yea that's true. I think I really should take off that exhaust manifold...
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Old 02-21-2004, 07:17 PM
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Also if apex seals are gone probably the turbine wheels are going to be damaged ??
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Old 02-21-2004, 09:20 PM
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Originally Posted by FD3S_wanted' date='Feb 21 2004, 08:17 PM
Also if apex seals are gone probably the turbine wheels are going to be damaged ??
Possibly, but sometimes not. Just take the exhaust off
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Old 02-22-2004, 12:47 PM
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Thanks, I will do what I have to do.
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Old 02-22-2004, 03:51 PM
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yes take off the exh. its a pain but you can see so much more. and get a better idea of what kind of ware is on the engine...I took my 13b-re manifold off. I found that my engine was in very good shape. looked like very little ware on the apex seals. and the copper gasket was almost new. almost no carbon very clean.
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