TD42 Nissan Rebuild for a turbo. 200RWKW

[garth]

Gudday smash250

have built the same project engine as you with the GT3071 garret running 25 - 27 PSI of boost.
The engine was a TD 42 with the 30mm gudgeon pins, oil squirter's for piston cooling and larger crank boss that has larger PCD for flywheel bolt up.
This is a pretty straight forward way of setting the good and not so good engines apart.

I used the essentially standard internals but with some set up changes to handle the higher boost. The liners were set in the block with a 3 thou over lay to get better seal with the head gasket. I used decent quality Japanese made pistons and rings, same with the bearings and factory nissan head gasket.
There are cheap td 42 pistons out there- not recommended.
The head was ported with standard nissan valves and quality race springs.
I balanced and crack test the engined for piece of mind then with a cut down flywheel together she went.
If you are ceramic coating the piston crowns and combustion chambers use a quality product as i ran into drama using a less expensive one.

The waste gate is a 38mm external turbo smart unit on 316SS extractors to 3" SS exhaust.
Injection pump is a Motor techs kitted with 12mm plungers and aneroid set at 15 psi for the second lot of fuel.
I used a 650hp PWR water air cooler and doubled up[ the radiators/fans for the cooling of the unit.
That with a double flow PWR radiator from a off roader and that's about it.

Its a engine configuration that works for me but some guys may want the earlier spool of a smaller turbo thats personal choice, i like the power at 2k upward to 4.5k.
When the engine tows my 3 ton boat the fuel needed to be de-tuned a bit as EGT's get high when towing but she still flies!

Have had it in nearly a year now and have had no trouble and its definitely the fastest diesel around and a landcruiser eater!


Good luck

[smash250]

Cheers for ur info Garth.

I have replaced the selves with semi finished ones and will be sending the pistons and manifold and turbo (exhaust side) off to get jethot coated. has then once i get it all back the pistons are getting mic'ed up and going to bore and hone block to suite. i have herd of people leaving extra clearance when boring for a turbo engine, dose anyone have any info on this? Also has anyone used the JetHot coatings and what did you think?

[garth]

gudday smash.

Extra clearance where? do you mean lowering compression? with the td42 you don't need to change any bore/piston clearances that I know of.
As for jet hot coatings, the idea is to keep the heat out of the head and pistons and in the combustion chamber (you will need to send head away also) so as long as it does that and doesn't crack like a cheaper one i used did the first time you'll be sweet.
I didn't bother ceramic coating the ex manifold or turbo but if you have the cash it cant hurt. Just the pistons and head cost a fortune!

Are you going to top or bottom mount the GT3071? would be interested to see the extractor/cooler set-up as i went bottom mount with extractors but wouldn't do it again.

good luck

[nastytroll]

garth do you have details on pistons? I will be building a similar motor soon running a GT2876R. Looking at 22 psi with 12mm pump, front mount cooler, modded inlet with 4 inch plenum.

Thanks Steve.

[garth]

gudday steve.

The set i used were 30mm gudgeon pin 'Ricon' (spelling?) Japanese made ones. they only come in set's of 4 for the td27 trucks so ended up with 2 spare.
They were available here from Truck and Bus Ltd or BNT.

What have ya done to the inlet? I chopped and welded mine to tale 3" intake pipe work from cooler by cutting out the return exhaust port and adding it to intake port for larger volume.

good luck with project

[smash250]

I herd of people giving extra clearance between the piston and bore, ie under pressure and extreme heat the pistons/rings expand and can become seized or start seizing.(Just what i herd) i think i am going to just use the factory clearances though. I am going to be using a top mount, i fabbed up the dump to suite yesterday, what a mission there's not much room between the back of turbo and firewall. Also because i do not have the engine all i have to go off is my Gq ute for dimensions, although im pretty sure the gq and gu will be almost identical. Im also worried about the turbo hitting the front shock inner guard, however if this happens i will just cut it out and weld some plate in to make it clear, but will not know for a few more week until i get all my engine bits back and start putting it all back together.

[300WinMag]

Go with the factory clearances for turbo spec motor, ie GUTD42T if you have the heavy duty turbo pistons to go with it. The idear of giving extra clearance is for motors without oil squirters under the pistons to allow for more expansion of the pistons. Personally I would just build the motor to turbo spec, I cann't remember what year model you have?

[nastytroll]

haven't cut it yet but will be cutting the top rocker side and bottum opposite corner and removing the top all together. Slitting a peice of 4 or 5 inch pipe at the angle to suit and purge welding it on with a 3 inch inlet snout to accomodate the front mount cooler piping.

Been real busy so I'm just trying to sorce all parts for the setup and do it in 1 hit. Doin the girls car to with a GU TD42T pump and GT2871R. Should be sufficient for her.

Thanks for the piston info.

[tim75b]

while everyone is here with the good advice what sort of clutch will hold up to 170kw in a patrol as its also of some importance to this kind of build thread

[nastytroll]

http://www.npcperformance.com.au/

Talk to doug.

[mavrickdan]

my silver top 92 has steel struted pistons and ring grooves

[xenith]

just boost it put my turbo on an early engine with km450 on it run 25 psi driven every day hard. now got 550 onit still stock every thing

[garth]

"Excedy tough clutch" with stepped fly wheel holds everything in place for my engine and no slip yet.
There are heaps of opinions and set-ups available for these engines but this clutch works for me....so far!

[300WinMag]

Does anyone know the size of the crank nut on the heavy duty GQ silver top motor.

Is the 98GQ modle ute motor a GU or GQ motor. I know it has the vacum pump on the right side separate from the alternator and I messured the crank nut at 42mm approx.
How boost and fuel are people running in that motor?

[love ke70]

Does anyone know the size of the crank nut on the heavy duty GQ silver top motor.

Is the 98GQ modle ute motor a GU or GQ motor. I know it has the vacum pump on the right side separate from the alternator and I messured the crank nut at 42mm approx.
How boost and fuel are people running in that motor?

mines a 97, is a black top, but whether its the weaker or stronger motor i dont know.
run 13 PSI, and increased pump and LPG injection, seeing 500* or so EGTS non-intercooled and havnt had an issue.
more fuel and an intercooler are in the pipeline.

[nastytroll]

silver and black tops are 41mm crank nut. Black tops run in 1994 model (late 1993 production) though N/A gu til the TD42T came out. TD42T has a 50mm or so nut Could be 54mm cant remember.

[BOOSTED GQ]

I have spoken to mark at JPC and he said my donk being an early silver top (92 model) that 160 to 180rwkw is fine untuched. Im chasing 160rwkw give or take 10 and I have just over 300k on the clock and he sad no prob, that he did one a while back with 400k on it untuched and it spun up 160rwkw with 35" treads.

[300WinMag]

What did they do to it to get 160RWKW, what turbo and pump mods etc?

[DanielS]

96 black top was the weakest of the weak, changed bore webbing etc.

Saying that, I'm - well I was running 21-23psi thru this engine, dyno @ 155kw @ 3600rpm at the treads on united's dyno back in late 06 (they said I wouldn't get over 120kw, ha ha). The truck has been getting a full chassis rebuild, so I havn't driven it for awhile. I still need to increase fuel as I'm only getting 450C on the pyro back then..

I'm not sure how long it will last once I start to push 600C, but I will find out soon...

Daniels

[BOOSTED GQ]

Air cleaner as the factory ones are to small, bb turbo custom made in house, injector pump, injectors, intercooler, 3" exhaust and custom coolant rail taped into the head to help cool the precups highly recomended. The one I went in had 160rwkw just over 2000rpm end held it to over 4000rpm tha was on 36" simex et2s so you can probably ad another 10 to 20kw for 32 or 33" tyres. I LOVED IT. As soon as I get the cash I will be geting the pump, turbo and coolant rail as I have the rest.

[300WinMag]

How much boost, what size pump plunger and what size injectors?

[BOOSTED GQ]

High 20s, 12mm rotor head, thay are the same size nozzle but heavier spring not just shimed up. the injector pump is not just a 12mm pump with a boost compensator he spent about 6 months devaloping it, and and his turbos are made to suit what power you want he told me he has about 14 different combos and thats how he gets such good low down and then pull through to over 5000rpm power depending.

[300WinMag]

Is that Andys (Diesel Techs) formula?

[BOOSTED GQ]

Im think its mark (JPCs) formula. I think you will find he pioneered the big hp td42s

[TUFFMQ]

The 1 his talking about with 160 is mine running 25psi on 35 creapy's and 4.11 ratio and 300000 on it was pretty happy but it's got alot of money spent on the turbo,injectors,pump ect.... But stock internalls and I don't drives
it easy either

rebuilding it now tho with the works and aiming for 220rwkw
plus

[drifter** *]

what turbo are you running?

[TUFFMQ]

It's a custome roler turbo T3/4 with a 70mm comp wheel and 70ar Jpc made it. Soon see if it will handal 40 psi if not have to get a bigger 1

[drifter** *]

what are the specs on the turbine side?

[waandy]

hey guys im doing a diesel conversion in my shorty soon and the motor i have has 380 000 on it, i am planning on running a dts kit and around 15 psi. do yous reckon i should freshen the motor up before boltin the turbo on? i was leaning towards a new set of rings and bearings but that also depends on what we find when it comes apart.
cheers
waandy

[garth]

gudday

depending on what your doing with it, towing etc I would, its personal preference though....but 380,000k's is Double what some "modern" engines are good for....

As you say see what you find...

good luck