Enuff

Well-Known Member

• Jul 9, 2017

• #1

I thought I would check with you guys as some of you know yer stuff..
My 1998 4.6 gems engine has a cracked block. 120k
I have a good 1998 4.0 gems engine spare. 108k
If I get the 4.0 block top hat lined will it slip seamlessly in to replace the 4.6 damaged block.
so far I don't think I have to change anything else.
Does anyone have any real life experience of this apparently easy fix. ??

 

martynv8

Well-Known Member

• Jul 11, 2017

• #2

Should be a straightforward swap, I guess your putting your 4.6 crank, pistons, rods, cam into the 4.0 once top hatted. Being both gems the CPS will be the same mounting (different on thor).
The 4.0 blocks are supposedly the weaker of the blocks selected but it's a lottery with Rover V8's anyway.

 

Enuff

Well-Known Member

• Jul 11, 2017

• #3

That's the plan Martynv8.. I guess a cracked 4.6 block is just plain dead and not repairable, so will use a spare 4l block with the good 4.6 stuff in it. Simples.
It was my fault for running the LPG to hot....Lesson learned.

 

Tony e

Well-Known Member

• Jul 12, 2017

• #4

Can you not try welding it first before you rip it to pieces. Not as impossible as it used to be. Very do able these days. If you calnt ime sure theres a welder near by that can. Would be better out but no need to strip it all down opening up a can of worms an all that worth a try. Nothing lost

 

C

Colthebrummie

Well-Known Member

• Jul 12, 2017

• #5

What exactly do you mean by running the LPG to hot?

Col

 

Enuff

Well-Known Member

• Jul 13, 2017

• #6

I'm led to believe if LPG is set too lean it causes an increase in engine temperature which is probably not good and may help in overheating, causing cracked blocks.

 

C

Colthebrummie

Well-Known Member

• Jul 14, 2017

• #7

I never knew that, thanks. My Kia Sorento runs on LPG but is running really rough especially on tick over, runs great on petrol. Must need a service but service places are few and far between, that's the only drawback of LPG.

Col

 

listerdiesel

Well-Known Member

Events Planner

• Jul 25, 2017

• #8

LPG burns at a higher temperature and has none of the cooling effect that petrol has when it is atomised in the inlet, so an LPG engine needs to have first class cooling and coolant.

Peter