Engine Health Check/Inspection. AJP8 Technical Info please!

[Mr Cerbera]

Hi William,

There are a lot of experienced engineers on here who know and understand what the best path to take is - several have already made their feelings known - I am not one of these types

BUT

If I had my body off, I think I would find it very hard NOT to remove the heads, clean the 83K of crap off, do a bit of amateur porting and put new head gaskets on.

If you haven't got a load of cash to pay others to do it then time and space are your only limitations and you are nearly there already

Just my opinion

[CerbWill]

After some disappointing leakdown test results, mainly indicating intake valve sealing issues, the engine is slowly coming apart Corroded head studs are making it slow work but with some penetrating fluid they're slowly coming off.. While its in bits I might as well check/change the main & big end bearings & piston rings as well as obviously getting the heads sorted.

Does anyone have a drawing/measurements of the standard 4.2L pistons so I can work out whether the liners or pistons are worn in the event that I find piston to bore clearance is out of spec once the heads are off.

[Jhonno]

Standard bore is 88mm piston clearance should be 0.004"

[CerbWill]

88mm exactly? Makes life easy! Thanks.