Dead Engine

[gsx600]

Well finally managed to get the head of the dead 4.0l as found no bottom end damage. Only broke my 2 16mm sockets, so had to buy an impact socket !

Not sure how to describe the mess of one of the pistons

It looks like something metal has been fired into combustion chamber mashed around at 5000 rpm taking bits of the head and piston and then welding them to various other bits of the head or piston

Not very pretty looking and something a skim is not going to resolve, unless you can skim 5 mm off

So looks like need a new head and piston at minimum to build up as a spare engine / ornament. Off to scour ebay now !



>>> Edited by gsx600 on Thursday 12th August 11:24

[350matt]

Are the valve heads still present?

Matt

[wedg1e]

If the valves are still present, you may have dropped a valve seat.

[gsx600]

Valve heads are all there, what do you mean by a valve seat ?

[350matt]

The ring of hardened material which is pressed into the head for hte valve to land / sit upon, If they're still there then it may have swallowed a screw / bolt from inside the intake system. Nasty

Matt

[gsx600]

That sounds about right, good job not using the injection system from the old engine and have another one on there.

Will have to look for missing bits from old inj unit!
That would probably explain the suddenness of the fault as well, must have turned into the hotel too quickley for something that had been dislodged

Hopefully get the manifolds and an adaptor for the oil pressure switch to run up engine properly today and finally get my garage back if I can shift the block to back of garden

[Boosted Ls1]

Whilst your at it, check the valve guides are complete and make sure nothing has got lodged inside the inlet tracts just waiting to drop down into the cylinder after your expensive rebuild! Are your heads ported or stock. I have some intermediate 4.0 parts here that I have no use for.

[gsx600]

What parts do you have ? Need a piston and a cylinder head (standard valves )to be able to start contemplating a rebuild. Everything else seemed to be ok with very little movement of big/ little ends etc etc. But still thinking on a large upgrade to this engine maybe cam, followers, springs etc ?

New engine nearly complete, but does not seem to be oil circulating so still not running it and waiting for adaptor to get oil pressure guage.

Tried priming the pump using a prime tool in place of the dist but after about 2 spins of the drill, it locked up, so either primed properly or I'm just

[350matt]

Take the front cover of the oil pump off ( entails removing oil filter sandwich plate first on a wedge) and pacj the space between the rotors with vaseline, re-fit the cover etc then fill the lines to and from the filter with oil.

It should then prime and move oil about.

Mattt

[350zwelgje]

Used the priming method you mentioned myself (it should be possible to continue turning the oil pump shaft!), and 'locked up' sounds like an oil pump problem to me (Including not producing any oil pressure). Perhaps best to take it apart and have a look. In theorie it is simple to be overhauled, but have not done it myself.....

Rob

[Boosted Ls1]

gsx600 said:

What parts do you have ? Need a piston and a cylinder head (standard valves )to be able to start contemplating a rebuild. Everything else seemed to be ok with very little movement of big/ little ends etc etc. But still thinking on a large upgrade to this engine maybe cam, followers, springs etc ?

I have the 4.0 crossbolt engine internals and a pair of stock intermediate heads. You can pm me if these may be of interest to you.

[gsx600]

Mike

Just sent you a mail and looked at your web site. It puts my DIY engine swap and rebuild to shame by the looks of things.

[Boosted Ls1]

gsx600 said:

Mike Just sent you a mail and looked at your web site. It puts my DIY engine swap and rebuild to shame by the looks of things.

Sorry about that, not meant towe all start somewhere. Got your mail and will attend to it tomorrow