Master
Hey Guys,
following the cooling problem a few weeks ago, I have what I presume is the cause. I believe the corroded nozzels on the coolant pump and top hose served to provide the point of least resistance to a cooling system over pressurising from what I believe is a head gasket problem.
In addition, when i run the car at stand still, while watching the expansion tank, an increase to 2000rpm has the coolant level dropping by a cm or so, and bubbling inside the tank occurring. Back to idle and it settles. I have not bothered with the coke bottle teast as i reckon the coolant was escaping through the weaker points in the system provided by the corroded parts.
At this point I am head in the direction of a head gasket change, but time and money is limited. I am confident (with PSimpson's definitive guide), of doing the job myself, but time is a problem, and while I could get the head off and on, any work required on the head, just compounds the time issue.
Another aspect of the job is the gasket thicknesses. I have found plenty of info on the job itself, but have never found a satisfactory explanation of the reasons behind the different thicknesses, and what it may mean in terms of previous work on the head.
As usual, any and all comments are appreciated.
NIck
PS 2000 TD5 160k
Master
SubscriberThe gasket thickness is to do with piston protrusion which is how far the piston tops come past the deck of the block. head work, if done correctly should have no effect on the gasket thickness.
When you take head off get it checked don't just put it back on, they do crack.
ChatterBox
Gasket thickness for these will be classified as 1 - 2 or 3 holes. 3 being 1.3 mm thickness from memory. (dont hold me to that)
The different thickness gaskets allow you to retain factory clearance from pistons, compression ratios and valve timing distances for the timing chain.
1 hole is the thinnest and 3 hole the thickest. Most kits come with the 3 hole gasket straight up, unless you make the kit up yourself and specify 1,2, or3 holes.
Get the head crack and pressure tested before you start spending.
cheers
Master
Nick,
in this link Graz tells were he got his TD5 head machined.
http://www.aulro.com/afvb/wa-aulroia...nder-head.html
Roger
Master
Nick, I cant copy & paste from my Rave CD but if you look in TD5 engine-overhaul-piston assembilies page 266 & 267 on my cd it explaines how to measure the piston protrusion to work out what thickness gasket you need.Originally Posted by Hastykiwi
Roger
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