Sorted split coolant pipe

ARP head bolts? Not necessary, just use a new set of standard bolts. ARP bolts are snake oil.

I believe that there are a number of different thicknesses of head gasket available, you may need a slightly thicker one if your head needs a lick to get it true.

ARL is the 150 tdi engine!

To the OP i have an ARL leon so if i can help with chassis number for a part or whatever pm me

Isit smoking atall lloyd? Are you still getting the coolant around the cap? Personally if i thought the gasket was on the way i would be finding a garage to pressure test it, dont risk leaving it and causing further damage mate.

Thanks gents booking it in ASAP. ARL Head bolts are meant to be stronger to stop head lifting again in the future.

Here you go babes http://www.darksided...pd-engines.html lol

Gasket, depends which is fitted matey, they came in 1,2 or 3 hole which measured the thickness, you'd need to know which yours has now.

Oh and a few people only losing coolant at high boost have had pressure test/sniffer test come back all ok despite the hgf

Hope you get it sorted out.

I didn't know about the ARL bolts, was only commenting on ARP from experience. Looks like a useful upgrade.

Was I right about the gasket? I haven't been down the pub for a while to check my facts.

The issue you run in to with skimming is the glowplug, injector and valve now sit closer to the pistons, so you lap the valves but still end up with your injectors and glowplug sitting closer..only very slightly but it can cause issues. Your valve and piston wont be any closer together (as you've lapped the valves back into the head) so fitting a thicker HG can just create more issues.

The general word is that PD heads aren't really suitable for skimming but a very tiny amount you can generally get away with.

hope you sort it out bowen, go for the worse case scenario, take it you enjoyed coombe, i've seen the vids looked like fun.

The issue you run in to with skimming is the glowplug, injector and valve now sit closer to the pistons, so you lap the valves but still end up with your injectors and glowplug sitting closer..only very slightly but it can cause issues. Your valve and piston wont be any closer together (as you've lapped the valves back into the head) so fitting a thicker HG can just create more issues.

The general word is that PD heads aren't really suitable for skimming but a very tiny amount you can generally get away with.

'Licking' a head is Engineer speak for taking a minimal skim to guarantee truth, our machine shop would always do it as a matter of course during the reconditioning process. Head gasket thickness is specified to ensure the relationship between the cam pulley and the crank pulley remains within tolerance since PD engines are incredibly sensitive to cam timing. But you knew that already, right?

As a matter of interest how little are you talking by minimal amount? Your machine shop dealt with porting out tdi heads before? If so I send me a pm with some details as we're heading off topic here.

Yes I'm aware of the sensitivity of the cam timing on these

Wonder why I am not losing coolant at 2.3 ish bar?

I can only assume its down to me already having ARL headbolts and perhaps the mapping is putting less pressure on whatever causes the head to lift in the first place? The mechanics of why headlift occurs is slightly beyond me.

How much power are you running as I doubt you're getting head lift off a mildly tuned tdi without massive amounts of boost pressure.

1) As a matter of interest how little are you talking by minimal amount?

2) Your machine shop dealt with porting out tdi heads before?

3) If so I send me a pm with some details as we're heading off topic here.

4) Yes I'm aware of the sensitivity of the cam timing on these

1) Touch-on and run, repeat if it doesn't clean up until you can't go again in which case replace the head casting.

2) No pointless porting, just reconditioning.

3) You seem to be driving the direction of the thread, I'm just responding to your questions.

4) I may have missed something but your explanation seemed to suggest other reasons for OE head gasket thickness variation which may have confused matters.

Try tightening the head bolts down a quarter of a turn, just incase the bolts have stretched!

1) Touch-on and run, repeat if it doesn't clean up until you can't go again in which case replace the head casting.

2) No pointless porting, just reconditioning.

3) You seem to be driving the direction of the thread, I'm just responding to your questions.

4) I may have missed something but your explanation seemed to suggest other reasons for OE head gasket thickness variation which may have confused matters.

Head work required to go over 300bhp iirc

Head work required to go over 300bhp iirc

Awesome! You have over 300bhp, how did you solve the fuelling problems?

With higher flowing nozzles.... I'm building a 300bhp tdi this year, hence the question. Nvm

Awesome! You have over 300bhp, how did you solve the fuelling problems?

My mates running a hybrid gtb2260vk with 120% firad nozzles!

More than enough fuel! Topping out at late 280's bhp as requires performance cam and head work

Therese a car from darkside running well into the 300's! Running twin turbo setup

...