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"Samuel" <firstname.lastname@example.org> wrote:
> results of compression test on my 2.6 litre series 3, from front to back.
> same results for wet and dry. the motor has been running well when cold but
> gets rough when warm, on either lpg or petrol. the spark is perfect on all
> cylinders so before comp. test i was thinking burnt exhaust valve.
> as the trouble cylinders are far apart (105 and 110), that rules out head
> same wet and dry suggests its not rings, which i was 99% sure of anyway.
> absolutely no crankcase pressure and no oil-smoke.
> exhaust valve is all it could be right? if so, is a set of new valves and a
> quick regrind within the scope of a backyard mechanic? anyone here who has
> done this on the 6 cylinder rover motor? i hear they are a bit weird to do
> as the exhaust valves are set in the engine block. do i need to remove the
> motor to do the regrind due to space restrictions?
> any help would be greatly greatly appreciated.
The 6-cylinder is great fun! The head/block face is at an angle
just to make things interesting. The head is also pretty heavy.
Getting it undone is straight forward, but (I did it myself) I'd
suggest that having another pair of hands for lifting it off would
be a good idea. Lapping the exhaust valves is fun - they are in the
block as you say, so you have to sit on the wing to do it, being
very careful where the grinding paste ends up.
The other bit of fun is the exhaust valve collets - they can drop
down into the oil gallery and have to be retrived with a magnet on
a bit of wire or string.
Putting the head back on is quite a challenge, but if you make up
a couple of temporary studs to locate it then its not so bad -
some help would be a definate plus.
You'll need one of each type of valve spring compressor as well,
one for the inlet valves and one for the exhaust.
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