Outer Limits 4x4 Board

Hi all as states above im after the knowledge of all those few people who have 170-200+RWKW TD42s and are obviously running high boost. What type of head gasket are you using? I just put the standard on in mine when i re-built the engine and i have just realized that the gasket is leaking out the side of the head under the intake manifold. The engine hasn't even done 1000ks yet but was running 22.5psi

cheers Ash

posted details on your build thread

So all the guys with high Hp TD42's are you just running a standard genuine Nissan head gasket or something else? I would love to get a couple of reply's. Also i would like to know how many of you claiming to have 200RWKW actually drive around with that sort of set up or if it was a ONCE OFF DYNO STAT before being DE-TUNED and if so what did you DE-TUNE it too? 180-170RWKW? cause i drove around for only just over a week with 170RWKW and now im taking my head off and i dont want to have to do this again any time soon.

Cheers Ash

why dont you call dzl-tec and see what he uses, if he has something specific im sure he would sell it to you.

i think his makes 180 or something and is daily driven...

O-ringing the block and using a copper head gasket is a good way of solving that problem. Fitting the steel o-rings is time consuming though. If i was you i would be looking for another reason as to why it blew out after only 1000k. Thats not a long time even with high boost pressure.

kane077 wrote:O-ringing the block and using a copper head gasket is a good way of solving that problem. Fitting the steel o-rings is time consuming though. If i was you i would be looking for another reason as to why it blew out after only 1000k. Thats not a long time even with high boost pressure.

what i was going to say, o ring the block

Cometic MLS gaskets? Also what is the deck finish like on the block? If it is too coarse then you will have troubles no matter what you do until it is re-decked.

I had stock gaskets, but i used hylomar to help it seal nice and strong.

I was running 30-35psi plus some other drugs on my td42 and never had a head gasket problem

I would be checking your timing advance also. Heaps of timing hurts

Has anyone priced up getting a td42 O-ringed???? I figured not. Its not worth it unless you can do it yourself.

I am afraid that the old td42 is not a viable Hi-performance power plant anymore or ever was actually. (i should know i had bulk dollars in 1 or 2)

Cheers Heath

Ok well i have pulled the head off now and can see whats going on.

Firstly both the block and head had been machined before it was all put together and both had very good Finnish.

Secondly when i put the gasket on, i used aerosol hylomar on both sides of the gasket. Now that i have removed the head i think it was actually the Hylomar spray which has caused the failure. the gasket its self has not blown it has rather not sealed between the hylomar and the block or the hylomar and the head. Im not a mechanic, the reason i used this hylomar spray cause i was told it was good to put on head gaskets to "get a better seal" however now that i think about it maybe it should only be used on paper/fiber type gaskets????

anyway here are some shots so you can see for yourself.












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It looks as though the hylomar has formed a skin which has lifted and allowed the leak. (it was leaking under the intake manifold)

Anyway, i started to clean the head up today and i have found more bad news, not super bad but a pain in the ass none the less.

Once i cleaned up the pre-comp chambers i noticed Cracks. so looks like the heads got to be sent off for new per-comp chambers now. has anyone else had this prob before, when running modified fuel pump? the last thing you would want is for the cracked piece of the chamber to fall into the bore and cut it all up.

wow ash u gave those precombs hell!

Hard luck mate

year try a ridge crest copper head gasket thay are the go i never have had a problem with mine i run 28PSI in mine every day of the week year the pre comps do that all the time get them changed out its all cool o ridge crests are not cheap

ratbagpatrol wrote:year try a ridge crest copper head gasket thay are the go i never have had a problem with mine i run 28PSI in mine every day of the week year the pre comps do that all the time get them changed out its all cool o ridge crests are not cheap

How much is not cheep? and where do you get a ridge crest copper head gasket? Why are copper ones so much better than the stainless one that i had? And is there any special method to installing a copper head gasket? does it go on dry? or do you use some sort of sealing agent like hylomar?


cheers Ash

i use spray hylomar on head gaskets all the time, although i haven't built a diesel in a long time.

gudday ash

I had cracks in the pre com chambers also, showed the head specialist and he reckoned "find something else to worry about" so back in they went.
mine were not quite as bad as yours so if its not too expensive it'll be 'piece of mind' to do them.

I used the copper based spray called 'Copper Gasket' with no probs on all my builds. (6' of injection timing advance)
However make sure the head,block and gasket are free of finger prints and oil. (MEK thinners works well)

Interesting what heath had to say about the mighty TD42... what other option is there for a reliable warmed up 6 cylinder? Nissan has nothing?

Easy to start looking sideways at the 4V, double overhead cammed, engine the opposition has eh?

regards Garth

smash250 wrote:How much is not cheep?

how much do you value your engine?

bogged wrote:

smash250 wrote:How much is not cheep?

how much do you value your engine?

lol oh lets see just over 20k$ so a little bit. the question was more 'How much' not if its too much i wont do it......

I have been out today and brought all new pre-comp chambers and also new head bolts and ordered a new Genuine head gasket as im not 100% the last one was genuine. i will be putting it on dry this time with extra attention paid to no grease and no finger prints. The pre-comp chambers i got are also the Turbo ones which are suppose to be bigger.

I will probably start putting it back together over the next two weeks.

cheers Ash

from the photos, I would say it wasn't sitting down right, some thing jamming it up and not sealing.
Or the head tension wasn't set right.
The pattern left on the head suggest it has blown out all the way along on one side, not the normal isolated spot across the middle that you would normally see.

this hasn't failed from hylomar, theres something else going on here.
go have another look,

may i ask what the $20k went on?

Did you do the work yourself or pay to get it done??

May be stating the obvious but make sure you get the head machined again. I would reconmend R Moore & Sons

Cheers

Zac

Hey Zac, Mate i did the work my self except the machining. the engine has had a complete rebuild with new liners which were bored and honed to each individual piston, the pistons turbo,turbo dump and manifold have all been ceramic coated, The engine has been fully balanced to 0.5g@6000rpm, the block was decked and acid washed, re-plugged, new high volume oil pump, modified fuel pump,injectors,crank was polished,little end bearings machined,new lifters,cam was polished,ported and polished head,port matched manifolds,water to air inter cooler,GT3071R turbo, the Head was machined, new valve seats cut new seals, doesn't take long to spend 20k when you rebuild a diesel, there's probably more machine work i cant think of.

And yes i am getting the head re-machined as it obviously needs a clean up, a lot of it is superficial though, but will get a skim when the new td42t pre-comp chamber go in.

Cheers Ash.

Zac are you Zac zeck? dont you have a high output td42? running the drilled and tapped head cooling system?

How far out of balance was everything??

Did much get taken out of the head when ported. When i looked at mine it looked pretty good un touched.

If you have not done your clutch yet, get a Nicks performance clutch. The only one that can handle the power and abuse and still organic plate

Cheers

hey ash what exhaust gaskets are you using?

1st i tried graphite/stainless material i water jet cut to shape...it leaked
then tried just 375'C sealant as suggested by some...it leaked
Nissan ones are not a perfect port match so don't want to use them.

now am about to spend dollars getting custom composite, graphite, ringed, ones made....any suggestions?

hope you don't have to go down this path too as your running higher boost also.

regards Garth

I not sure how much out the enige was before it got ballenced i just told them i wanted it ballenced to 6000rpm and when i went to pick everything up they said they got it to within 0.5g's.

As for headporting yes alot did get taken out more so with the matching of ports though.

And yes i did changed the clutch, i had a custom one made with a clamping pressure of 18ftlb per square inch As for the gaskets Garth, i used aftermarket nissan one with hylomar sprey back and front and they seem to be doing the job nice.

cheers Ash

smash250 wrote:I not sure how much out the enige was before it got ballenced i just told them i wanted it ballenced to 6000rpm and when i went to pick everything up they said they got it to within 0.5g's.

As for headporting yes alot did get taken out more so with the matching of ports though.

And yes i did changed the clutch, i had a custom one made with a clamping pressure of 18ftlb per square inch As for the gaskets Garth, i used aftermarket nissan one with hylomar sprey back and front and they seem to be doing the job nice.

cheers Ash

Factory nissan gasket all the way mate. did so on my turbo petrol and turbo diesel.

So how many psi is the clutch? that's to hard to work out 18ftlp per square inch??????

Did the Nissan gaskets match your ports? or did you need to die grind them to fit?

I made a set up but when die grinding the SS laminate it left burrs that looked like they would never seal.......

As for balancing its a worth while job. dunno if I had an engine that was made on a 'Friday afternoon' but there were rods up to 9.5 grams out of balance.

garth

The Nissan gasket matched my intake port but the exhaust ports were WAY out but thats why i port matched.

As for the pressure plate, its 24 NM per square centimeter its too hard to convert to psi. all i know is on of the guys in my club have it made for me, he owns a company call precision automatics, and he said its what they are using on the twin turbo v8s and that it was the strongest one that he could get made.

cheers Ash

uzdnabuzd wrote: 18ftlp per square inch??????

Isnt that 5.4774 psi

yeh genuine nissan for sure mate of mine has a gq with 340 rwkw 4.2 diesel all nissan gaskets holds fine

^^^ NO, no he doesnt!

^^^ NO, no he doesnt!