260Z no compression in 4 & 6

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Dan Ryan - 16 Aug 2003 06:29 GMT

I'm looking at buying a 74 260Z and it has no compression in cylinders
number 4 and 6. The rest of the cylinder is within spec. I was thinking
maybe CAM type problem? has anyone else seen something like this?

Thanks,

Dan

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Eric Mild - 16 Aug 2003 12:21 GMT

um...it's early as hell my time...but this is my thinking....
if you have no compression in cylinders that are next to each other, it
would make more sense that the head gasket is blown.
I would think that if it were mechanicle...only one cylinder would be bad...
there are ways to check to find the diff....
take number 4, put it to TDC on the compression stroke...pull the plug...add
air into cylinder...check for bubbles in water or oil (sign that the gasket
is damaged) check for air coming out of the intake (bad intake valve) or
from the exhaust pipe (bad exhaust valve)
hope that helps.
eric.

> I'm looking at buying a 74 260Z and it has no compression in cylinders
> number 4 and 6. The rest of the cylinder is within spec. I was thinking
[quoted text clipped - 3 lines]
>
> Dan

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Holden McGroyn - 23 Aug 2003 20:10 GMT

> um...it's early as hell my time...but this is my thinking....
> if you have no compression in cylinders that are next to each other,
[quoted text clipped - 15 lines]
>>
>> Dan

Cylenders 4 and 6 are not next to eachother in a L26 engine.

The prob. could be anything from bent/broken/burned valves to cracked
head or even cracke block.
check for oil in water/water in oil, also look to see if valves in
question are moving correctly.
You may need to pull the head to diagnose, since you'll pretty much have
to do this to correct whatever problem exists, the seller may let you
pull off the head. [Remember to secure the timing chain before unbolting
the cam-sprocket!]

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