[ROVERNET - UK] Rover P6B - compression test query

Slatskars slatskars at comcast.net
Wed Nov 29 21:36:21 GMT 2006


The float level determines the level in the jet. Think of it as a coarse 
adjustment. Then you fine tune with the jet adjustment. If the jet 
adjustment will not tune properly, then it is probably the float level or 
air leaks around the shafts.

----- Original Message ----- 
From: "Peter Mitchell" <peter_m at amnet.net.au>
To: <rovernet at lyris.ccdata.com>
Sent: Wednesday, November 29, 2006 1:41 AM
Subject: [ROVERNET - UK] Rover P6B - compression test query

> Hi Netters,
> I dropped my P6B off to mechanic near my work today so he could have a 
> good
> look at some serious problems that I have been having with an inconsistent
> idle and difficult starting.
> I asked John, the mechanic, to do a compression test to establish whether 
> I
> was facing major problems with a completely worn out engine and high
> crankcase pressure. At the same time he fitted new plugs and set the 
> timing.
> This sorted the starting problem instantly, but the engine will not idle 
> at
> a consistent number of revs - I have had to resort to left foot braking so
> that I can keep some throttle on when waiting at traffic lights.
> Since the new plugs were installed and the timing adjusted, the car is 
> more
> lively under power, and tomorrow we are going to check the carburettor 
> float
> level (the carbs have just been overhauled), John feels that the most 
> likely
> source of the idling problem will be traced back to the float level.  I am
> also going to put in a better oil than I am using at present, and will go
> for a Penrite brand suitable for older engines.
> Have members experienced these problems with the float level being too 
> high?
> My brother is a mechanic (originally a Land Rover apprentice with Faulls 
> in
> Perth) and agrees with my mechanic's viewpoint.
> For your information the compression test results were:
> Cyl psi
> 2 125
> 4 125
> 6 110
> 8 100
> 1 125
> 3 125
> 5 115
> 7 115
> Thus the lowest cylinders were no 8 at 100 psi and no 6 at 110 psi.
> May I ask those more experienced than I, am I safe to expect a few more
> years of modest weekend use, or do I need to start saving for a rebuild?
> Opinions would be most welcomed.
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