Thread: TD5 Head Strip....

What a tremendous job you have done on this photo sequence.
I almost wish mine were a td5, not a 300tdi, so I could pull it apart just for the experience.
Bloody terrific job there, looking forward to the final installments.
But please show how the valve clearance is set. When I saw the valves so well hidden under the camshaft I thought how on earth do you keep tab on the clearance. Even though the 300 has hardly changed in 200k. I still like to occasionally check. The td5 from the pics looks formidable.
llandro

you dont do the valve clearance on a TD5... its got tappets... what you do do is on a rebuild is adjust the clearance to the injector....

its the same principal as the valves on a TDI BUT one screw up is worth oh $1400is for each injector plus anything else you pooch.

fozzy is due a service shortly so if its of use to you since it uses the same design on the top end I can do the pics of that for you.

Originally Posted by Blknight.aus

check the bore alignment of the Cam journals, new bearings if needed,

Definately do the bump clearances if I can find the pics of the detroit one that was set wrong I'll put them up for you very impressive levels of carnage.

Id pull the the valve springs and check the stems + clearances as well as getting confirmation on the hardness of the facing.

Dave,

These don't have seperate bearings for the cam, the tunnel through the head and cam box halves IS the bearing surface, rather like a Mitsu 4G32/37/52/54 bla bla galant/ sigma etc.
This is a problem if the cam picks up, but then again if THAT happens, the whole show is a bin job
As Pete said, it has only 98k, around 200 I'd be definately dong it, but I've pulled them apart at 250oddk and found them to be pretty good, but that depends a lot on servicing etc and the way the owner treats it. I'd reckon Pete dotes on this truck, even tucks it in at night and may even be caught in the wee hours reading 'Thomas the tank engine' stories to it with a mug of warm milk in hand...

JC

Originally Posted by Blknight.aus

check the bore alignment of the Cam journals, new bearings if needed,

Definately do the bump clearances if I can find the pics of the detroit one that was set wrong I'll put them up for you very impressive levels of carnage.

Id pull the the valve springs and check the stems + clearances as well as getting confirmation on the hardness of the facing.

Hi Dave,

The cam runs in the machined top face of the head casting and the underside of the top head section. It doesnt have bearing as such. Certainly none I could change.

eta Justin you beat me as always!

Rgds
Pete

dont laugh at me youre so right!!! lol

Just sent you a PM Justin with another quick question!!

Cheers
Pete

Pete,

Another interesting thing you may have noticed is the shape of the cam lobes driving the injector rockers. They have VERY aggressive opening and closing ramps, and are that shape because the compression/duration of the actual injector plunger is controlled this way. Injection of fuel into the cylinder is controlled electronically via firing the solenoid in the unit injector body, so the plunger is there to provide pressure prior to actual injection.
Now you can see why a 5w** oil is recommended, so that these rollers and lobes get lots of oil QUICKLY on startup. Even so, early editions of this engine I have seen with hardfacing coming off the cam and rollers, even WITH 5w30 Mobil1 synthetic oil used from day 1.

Clean, high quality oil with a 5w rating is a must in these motors.

JC

Thanks for the info Justin.

surface all look like new which is good

Oil is one thing I take very seriously.

Head is now looking like this:

Originally Posted by justinc

Dave,

These don't have seperate bearings for the cam, the tunnel through the head and cam box halves IS the bearing surface, rather like a Mitsu 4G32/37/52/54 bla bla galant/ sigma etc.
This is a problem if the cam picks up, but then again if THAT happens, the whole show is a bin job
As Pete said, it has only 98k, around 200 I'd be definately dong it, but I've pulled them apart at 250oddk and found them to be pretty good, but that depends a lot on servicing etc and the way the owner treats it. I'd reckon Pete dotes on this truck, even tucks it in at night and may even be caught in the wee hours reading 'Thomas the tank engine' stories to it with a mug of warm milk in hand...

JC

brain in friday arvo 3 beers down mode...

Id still be checking the bore alignment tho simply because the head was machined... been caught out on one where the thing had been machined but the cam journals were warped out. (not a td5)