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[hotel21]

.....Last night whilst tidying workshop I just happened to glance at the block which is still in the car.....   number 4 cylinder has a hole in it   so would that explain oil and obviously low compression...

Remember Markie, that you are a Honours Graduate from the Stevie Wonder School of Carwashing so you have a wee track record of sometimes missing what perhaps could be obvious.....      

Sounds like you have all the bits there to rebuild, as well as past experience.  Get stuck in!!  

[Marks DTM Calib]

Pictures of the piston crowns would be good....

WIth a hole in the piston, I'm slightly surprised there is any compression, I guess its not a very big one!

[Markie]

Pictures of the piston crowns would be good....

WIth a hole in the piston, I'm slightly surprised there is any compression, I guess its not a very big one!

Yep, was dark last night and at work today, will get some pictures up later.

When i say a hole its an indentation of 1.5cm along right in the middle, with a screwdriver head sized hole.

But i do get the impression that forcing (for example) a 10mm spanner along it will see the hole get substantially larger.

Number 2 with no compression is "perfect" at this stage...

[Marks DTM Calib]

Is the timing adjustable on them, if so it might have been pinking badly.

Or running very lean.

[Markie]

Is the timing adjustable on them, if so it might have been pinking badly.

Or running very lean.

Both   car running very lean on its death drive ( back to my garage) Timing was also woefully out of place....dont know if related but my K series cam locking tool wouldnt fit between sprockets.....they seemed fractionally too close together

It truley was the worst kept car mechanically i havd ever seen. In an attempt to resolve its running issues it had a brand new complete exhaust system, brand new plugs, leads, coil, dizzy cap and fuel filter.

[JamesV6CDX]

Complete rebuild me thinks

Will you still rebuild the head? I hope so...

[Kevin Wood]

If it's been running lean enough to hole a piston the exhaust valves and seats will have taken a bit of punishment, so I'd be rebuilding the head and lapping the valves back in after a careful check at a minimum.

.. assuming the yet-to-be-found gaping hole in no.4 is not in the head, of course.  

Thinking about it, the pocketing in the piston crowns looks odd. Have the pistons been pocketed for 2 different valve arrangements to save money or are some of those marks the result of valves bouncing off pistons?

Kevin

[Markie]

Complete rebuild me thinks

Will you still rebuild the head? I hope so...

I think so - remember this is now a not for profit, not for use head rebuild, i find i learn best this way and i want/ need to learn.

Unfortunately those of us too far north cant really get first hand viewing and learning from the masters at work ( Aka those that have an input to this thread   )

Therefore we need tae dae it oorsels  

[Markie]

tonight i wil take some good pictures of the block thats hanging on the engine hoise from a previous rover ( it has no issues) and post the pictures back to back with the photographs from the head from the car currently being dismantled. That should allow for much better analysis of the markings....

[JamesV6CDX]

If you're not in a rush.. Swmbo and I want to head to Fort william again to see all the places we missed last time - as soon as I can blag time off.

I'll happily give you a hand with a head rebuild.

[JamesV6CDX]

Having said that, it's really not a difficult job, and well within your capabilities if you can change head gaskets..

I was really nervous about taking mine apart, but after some guidance from all here, especially Mark and Kevin - I tackled it, and surprised myself at how easy it was.

Have you got that valve spring compessor yet

[Markie]

Having said that, it's really not a difficult job, and well within your capabilities if you can change head gaskets..

I was really nervous about taking mine apart, but after some guidance from all here, especially Mark and Kevin - I tackled it, and surprised myself at how easy it was.

Have you got that valve spring compessor yet

No rush at all, will take its place between misfiring tow car, Rover head change, and vectra radiator rebuild....

Lack of rush shown in the fact i dont have spring compressor yet....any recommendations?

[JamesV6CDX]

£35 from Halfrauds. It's laser, but bloody good.....

[Markie]

£35 from Halfrauds. It's laser, but bloody good.....

how about...

http://www.machinemart.co.uk/shop/product/details/cht459-hd-valve-spring-compressor

£10 cheaper, no halfords in city centre but there is machine mart....i need to check the clearance obviously.

This is where the women get confused - call home to SWMBO to measure head height, then despatch a girly from the office to local machine mart with a shopping list   cant go myself i am to busy here...

[JamesV6CDX]

compared to mine, it doesn't look up to the job.. I may be wrong...

Pay the £10 extra if I were you (or borrow mine)..