300Tdi Headgasket - thickness

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jamesmartin said:
you should know most shops just skim heads there not producing performance heads,so yes it does for most, and again with 300 tdi at least 15 year old engines any loss is unnoticeable , how many fitting head gasket themselves have a dti and the understanding to use it ,what you might do when building engines is different and not really necessary to what a diyer is going to do on their drive
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Yes, I should know - and I think you are insulting the knowledge and experience of machine shops,clearly there are good and bad,but valve stand down is so basic its not even worth discussing to anyone with a front door that opens to accept head facing jobs.
And measuring valve stand down does not need a DTI, a straight edge and feeler gauges or similar will do.
I really cannot see the point in encouraging DIYers to take short cuts when with little extra effort they can do a pro job and be confident in their engine running for many thousands of hours/miles.The TDI is a darn good motor and many are still doing good work - why lessen their useful performance or life with shortcuts ?
 
eightinavee said:
Yes, I should know - and I think you are insulting the knowledge and experience of machine shops,clearly there are good and bad,but valve stand down is so basic its not even worth discussing to anyone with a front door that opens to accept head facing jobs.
And measuring valve stand down does not need a DTI, a straight edge and feeler gauges or similar will do.
I really cannot see the point in encouraging DIYers to take short cuts when with little extra effort they can do a pro job and be confident in their engine running for many thousands of hours/miles.The TDI is a darn good motor and many are still doing good work - why lessen their useful performance or life with shortcuts ?
Click to expand...

im not insulting any shop ,most people that take their head for a skim get just that ,who mentioned valve measurement i was talking about piston protrusion measurement,the point is they will still have a good running engine ,and is how most will get done
 
No,the point is that engine shops WILL measure stand down and adjust seat height to suit.Which is a measurement that DIYers can check - same as piston protusions,a straight edge and feeler gauges are all you need.
Sorry to bang on,but last week I came away from a day of judging 3rd year Uni students engineering projects where the main topic of discussion amongst the judges was the lack of basic understanding of engineering principle.None of it is rocket science,a little reading and practice can lead to a whole better understanding and end result = pride in job.
Or is this forum just a bodge the product deal - which lets face it doesn't have a top notch reputation for reliability?
 
eightinavee said:
No,the point is that engine shops WILL measure stand down and adjust seat height to suit.Which is a measurement that DIYers can check - same as piston protusions,a straight edge and feeler gauges are all you need.
Sorry to bang on,but last week I came away from a day of judging 3rd year Uni students engineering projects where the main topic of discussion amongst the judges was the lack of basic understanding of engineering principle.None of it is rocket science,a little reading and practice can lead to a whole better understanding and end result = pride in job.
Or is this forum just a bodge the product deal - which lets face it doesn't have a top notch reputation for reliability?
Click to expand...

no they wont generally unless you ask its a much more expensive job than just a skim which most have a set price for , as i said what a experienced engine builder might do isnt what happens in the real world with 15 year old vehicle and a guy wanting to get an engine running again without it seeming over complicated or too expensive, which they do very well ,even with a gasket thicker than opitmum, and fitting thicker gasket is the fix most make through cost
 
eightinavee said:
No,the point is that engine shops WILL measure stand down and adjust seat height to suit.Which is a measurement that DIYers can check - same as piston protusions,a straight edge and feeler gauges are all you need.
Sorry to bang on,but last week I came away from a day of judging 3rd year Uni students engineering projects where the main topic of discussion amongst the judges was the lack of basic understanding of engineering principle.None of it is rocket science,a little reading and practice can lead to a whole better understanding and end result = pride in job.
Or is this forum just a bodge the product deal - which lets face it doesn't have a top notch reputation for reliability?
Click to expand...

how much can be skimmed from a head before this becomes an issue?
 
valve head stand down for 300 tdi,inlet .81 to 1.09,exhaust .86 to 1.14,or inlet 32 thou exhaust 45 thou, bearing in mind lr recommend replacing head if warping is above 3 thou and not skimming,theres not allways much to skim off before stand down is reduced too much as valves do run very close to piston top as is often evident
 
Ok, so i'm pretty much geared up for this, and plan to:

Remove head, send off to be skimmed and pressure tested (do I need to remove any other components for this?) They do this in 4 hours apparently.

Order this: Turner Engineering 300TDI head fitting kit

Refit with a 3 hole gasket, although I will check with the engineers what they think would be best considering how much they skim?

Adjust valve clearances.

Fill and bleed the coolant system.

Have I missed anything?

Thanks
 
jamesmartin said:
valve head stand down for 300 tdi,inlet .81 to 1.09,exhaust .86 to 1.14,or inlet 32 thou exhaust 45 thou, bearing in mind lr recommend replacing head if warping is above 3 thou and not skimming,theres not allways much to skim off before stand down is reduced too much as valves do run very close to piston top as is often evident
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cheers:)
it was actually aimed at mr eightinavee ;)
 
nrgserv said:
how much can be skimmed from a head before this becomes an issue?
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The answer to that is in the figures that James has supplied - easy to check with straight edge and feeler gauges. As long as the gap is more than the min figure then there is no issue.
 
I know this is an old thread,
Reading as I'm replacing my head due to blown gasket.
Exhaust gas bubbling out of expansion tank.
But my Land Rover manual does state...
Head can only be skimmed up to 8 thousands of an inch max and that then the valves must also be taken in the same.
But a problem is then your injectors will protrude towards the pistons accordingly.
Being 27 years and 14000 miles. I have just bought a new head with new valves all installed, it makes sense.
However the new head comes with a 3 hole gasket and the original one is a no hole gasket.
So I'm scratching my head a bit !
 
Wagon Loon said:
I know this is an old thread,
Reading as I'm replacing my head due to blown gasket.
Exhaust gas bubbling out of expansion tank.
But my Land Rover manual does state...
Head can only be skimmed up to 8 thousands of an inch max and that then the valves must also be taken in the same.
But a problem is then your injectors will protrude towards the pistons accordingly.
Being 27 years and 14000 miles. I have just bought a new head with new valves all installed, it makes sense.
However the new head comes with a 3 hole gasket and the original one is a no hole gasket.
So I'm scratching my head a bit !
Click to expand...
The three hole gasket is the most common and the thickest which is probably why it is what is supplied. I cannot remember now how to determine the thickness required but think it is to do with the distance from top of piston to top of block. I do not think it is relative to the head. But this is dredging the depths of memory and I would have to go and look it up to be confident.
 
dag019 said:
The three hole gasket is the most common and the thickest which is probably why it is what is supplied. I cannot remember now how to determine the thickness required but think it is to do with the distance from top of piston to top of block. I do not think it is relative to the head. But this is dredging the depths of memory and I would have to go and look it up to be confident.
Click to expand...
Thank You,
I have the technical manual and can measure with an engineers edge and feeler gauges. Also had a chat with the knowledgeable lady at Turner engineering. Very helpful they are 👍
 
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