Outer Limits 4x4 Board

Hey guys,
Looking for some info on when the block design changed on the TD42?
I have been told it was around 95 / 96 is this right? Are there any identifing features?

all i know is august 93 was the date of change from heavy pistons to light pistons...

apparently heavy pistons are much better with boost.. as they got a higher tolerance with the boost compared to the lighter ones melting.

TOM

As GQ said, there was a change to the internals between non-turbo engines in August 1993, then another change to the block in early 1996 (March I think?).

Quick way is to check if the brake vacuum thing is remote mounted off the RHS of the block, under the power steering (instead of on the back of the alternator)?? If it is block mounted, then its post 1996 build.

At some stage there was a change to 4 bolt engine mounts too....not sure which one of those two dates above it coincides with though?

Cheers
Mitch

Thanks for that guys, from what i have looked at on my engine its a 4 / 96. So does that mean high boost is not recommended for this block say around 20 - 25psi?

DanielS wrote:Thanks for that guys, from what i have looked at on my engine its a 4 / 96. So does that mean high boost is not recommended for this block say around 20 - 25psi?

20PSI? 20 is very high, with most running 14-16.

So its a 04/1996 non-turbo engine?? Then lotsa boost is a very bad thing! Have recently seen two late 1995 non-turbo engines (lighter rods and pistons) shit themselves from aftermarket turbos running 14psi or less. Showed itself in cracked pistons, pre-comb chambers etc. There was a piece of pre-comp the size of your finger-nail sitting under one of the valves...no wonder that cylinder was a little low on compression.........

At 20 psi, it could last for 2 weeks, or up to 2 years!?!?!?

DanielS wrote:Thanks for that guys, from what i have looked at on my engine its a 4 / 96. So does that mean high boost is not recommended for this block say around 20 - 25psi?

prolly the safest way to do it would be to run a maximum of 10 pounds of boost... 15 is pushing it...

the pre aug 93 motors have heavier pistons and rods and have higher tolerances and can probalby handle more boost than the post 93 engines.

TOM

20+ boost you'll be flat out keeping the valves shut even with aftermarket H/D valve springs

most guys are running 15 in comps n stuff

Thanks for the info guys, Im currently running 13psi of boost but have been talking to some people about getting my pump done(12mm plunger bigger distributor head etc) and have been told that they run around 18-25psi to burn the fuel? Mitch the bits of piston everywhere dont sound good though.












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You don't need to run 20 odd psi "just to burn the extra fuel".....provided the pump is setup correctly with an aneroid etc.

How long do you intend to keep the donk for?? If its just a crash and burn truck, it may be worth it, but I wouldn't be trying big boost with the later non-turbo engine if you expect it to last a reasonable length of time.

The Navara TD27 rods and pistons are interchangable with TD42 rods and pistons, so too are TD27-T and TD42-T. So we found a knackered TD42 with a good head and built a "turbo spec'd" engine up from scratch using Navara parts....got the cam reground at the same time, everything balanced etc....that would be the most reliable way to go.

Cheers
Mitch

Mitch, how did building up that motor work out for cost?

What it cost us won't be reflective of what it may cost someone else.....cost us less than $600 for parts to build it up, including the cam work etc, but only because my driver is a diesel mechanic and deals with wreckers alot too. The tired TD42 engine was bought for about $400 I think, which is cheap considering the head was fine. It took a while to find enough TD27-T rods and pistons in good enough condition to make it work. Cam grind was $120. The rods and pistons come as a matched pair, so can't be seperated if one or other is damaged.

The thing is, TD27 engines don't demand the same premium as the TD42 engines, so their parts can be had for a fraction of the price. And if you're willing to wait for the right bargain, things can be found at a realistic price.

Cheers
Mitch

Thanks Mitch, at the moment i'm looking at a 88 block to build up, and yeah prices for pistions etc is fairly expensive, so all alternative are being looked at.



P.S- Cracking game on saturday, eh?

Hi, I have a few engine parts laying around, but dont have a block.
If you need rods, or cranks, or a head let me know.
Mick Christie

that sounds great Mick, could you drop me an PM and let us know how much your chasing for some of those parts?


How your rock crawler going?

complete engine, had the head doe needs 4th piston rings and resleive, it has new injectors, water pump too i wana get rid of it its taken up room for other crap.