4.2 rebuild

Joined: 25 May 2003 Location: Redbank Plains, QLD

Going to rebuild the ol 4.2 i have sittin here.

I would like to turbo this one and put it in my GQ (replacement for my 2.8)

Can anyone recommend on pistons etc?.. I will be havin the block relined and the head done up.

Any suggestions or ideas.

Im plannin to whack a cummins turbo on it as one guy has it on his GQ and it has eliminated all the lag he has on his car.

Suggestions anyone???

My diff ratios are 4.6s (standard with 2.8 TDs) so shoudl be good for the 35's which are going on after the swap is done.

Tom

Joined: 25 Nov 2002 Location: Golden Square

have alook at the 4wd systems site they do rebuild kits for the TD42, Donkyatt may also. They include most bits and cost about $1299 or something like that.
Also have you got yourself a gearbox to suit as the 2.8's come with the 300zx gearbox and the TB/TD42's came out with a more HD one.

I havnt worked out what I am going to do with mine as it needs a rebuild before turbo install. So not sure if I should get a TD42 or a TD42T from the wreckers or rebuild the one I got. My main reason for going for one from the wreckers is I want to upgrade all the other bits to newer stuff (ie ALT/VAC set up). So I thought this is the easy way.

Joined: 22 Nov 2002 Location: Townsville/Middle Swan WA

ceramic coated pistons ... custome I/C and big boost twin 3" snorks
3" exhaust Twisted Evil

Posted: Thu Feb 05, 2004 8:24 am

Prolly the best thing discussed with your engine rebuilder - they will have all the info as to what's available for your motor, and accurate prices.

Joined: 06 Mar 2003 Location: Campbellfield

where are you??????

Joined: 25 May 2003 Location: Redbank Plains, QLD

Im in the gold coast. And yeah i intend to rebuild it myself. Which is why i asked forum members what they thought would be best and whether they have done it and pro and cons of doin it etc.

It will be turboed at a later stage, it will be installed in the GQ in its naturally aspirated form. Will the n/a pistons be up to the task of turbocharging?? Or should i look into a late model piston??

Are all GQ 4.2 diesels the same donk throughout?? from GQ to GU ???

Reason for askin is whether parts are interchangeable - eg pistons , head etc?

Cheers and thanks for answerin my questions

armsup

Tom

Joined: 06 Mar 2003 Location: Campbellfield

Slightly different blocks

Different pistons, con rods, cam grind

If you want to turbo you are better off getting a TD42T out of a GU

Can’t say to much as I will give away my secrets

BUT cam grind, balance pistons and conrods, and lighten & balance flywheel.

Joined: 09 Dec 2002 Location: Hervey Bay

Ring Engines Australia in Brisbane...I bought my kit from them..$1200...That covered everything...Pistons,sleaves,Conrods, Bearing, Gaskets..

Basiclly all standed,just went 10thou over sized on pistons,mains bearing and big end bearings..got the thickest head gasket to lower compression for the turbo...

i rebuilt it 2 year ago running 10-14 pound boost have had no problems...

Bretto

Joined: 13 Apr 2003 Location: Melbourne

bigtruck. wrote:

..got the thickest head gasket to lower compression for the turbo...

i rebuilt it 2 year ago running 10-14 pound boost have had no problems...

Bretto

What comp are you achieving approx now mate?

What thickness head gasket?

Wouldn't there be de-comp plates available, or is this dropping the comp too much. I've never done a turbo conversion on a diesel, but am buying a 4.2 GQ soon, and will want to be doing this pretty well straight away depending on the k's it has on the odo.

Cheers
Boopa