Engine/Compression - answer

[John Hertog <crossram@xxxx>]

Hi Jonathan,

Sorry to hear about your low compression problems. It is good that you took
a compression reading. Please inform us specifically what cylinders are
affected - are they adjacent? what are the two cylinder numbers?

Basically, low compression such as you indicate should emanate from
somewhere around the valve area... it seems doubtful that it could be a
piston / ring problem.

Remove the intake and valve covers and observe the valves opening and
closing for the affected cylinders. Are the pushrods correctly located, and
are the rockers moving up and down as the others? Have the lifters pumped up
?

No, low compression cannot be due to carburetor. Compression occurs when the
piston travels upwards and pushes air ( and fuel, hopefully) into the
combustion chamber, where both valves should be shut..

john


----- Original Message -----
From: "Jonathan Sacks" <jwsacks@xxxx>
To: <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Friday, November 16, 2001 2:19 PM
Subject: [Chrysler300] Engine/Compression question


> Hi all,
>
> Quick question about compression:
>
> I just had my 413 rebuilt along with the carb.
> Replaced/rebuilt a lot of the other engine components
> at the same time.
>
> Unfortunately, after putting it all together and
> starting it up I find that I have low compression in
> two chambers. Around 30 when of course it should be up
> around 90.
>
> Now I've heard differing views on this, but my
> question is, can the compression problems be anywhere
> besides inside the chamber. Like in the carb, maybe?
> Or does it have to be either the rings or how the
> valves are seated?
>
> I guess what I'm asking is, am I going to have to pull
> the engine off and get the rebuilders to take it apart
> again?
>
> Always grateful for the advice,
> Jonathan
>
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