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Car Forum / Nissan / Nissan Cars / January 2008

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'85 300zx Non-Turbo: Low Compression in #1 Cylinder

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BB - 18 Jan 2008 14:32 GMT
Hi,

 Long-time Z car lover, first time poster.

 I have an '85 non-turbo with 190,000 miles that I've had for about
4
years. The body is great, but the #1 cylinder has low compression.
The
"wet" and "dry" compression tests yielded similar numbers, so... what
does that mean? Does that mean that the rings are OK and it has some
kind of valve problem?  I wonder if the timing belt broke for the
prior owner (can't that do valve damage?).

 Has anyone else seen a problem like this?  I know with this many
miles that the best course of action may be to get a rebuilt engine,
but I was kind of hoping that something cheaper may work.

 Even with 7.5 (?) cylinders it has a lot of power.

Thanks.
BB - 18 Jan 2008 19:00 GMT
> Hi,
>
[quoted text clipped - 16 lines]
>
> Thanks.

Sorry, that's 5.5 cylinders.    :(
still just me - 18 Jan 2008 19:41 GMT
>The
>"wet" and "dry" compression tests yielded similar numbers, so... what
>does that mean? Does that mean that the rings are OK and it has some
>kind of valve problem?  I wonder if the timing belt broke for the
>prior owner (can't that do valve damage?).

The wet test should seal the rings... to you have an upper end leak.
If it was a bad head gasket, you'd likely have problems in two
adjacent cyl's. Probably valves.
 
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