Discovery head Gasket

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bordonladdie

Member
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Looking at the parts catalogue , there are three different thicknesses of gaskets for the 300 TDI. How do I identify which thickness gasket is fitted before I start pulling off the cylinder head.
 
There are 4 actually, and I still don't have a clue which is for what engine

LVB500200 HEAD GASKET 1.37mm 1 HOLE 200/300 TDI
LVB500210 HEAD GASKET 1.48mm 2 HOLE 200/300 TDI
LVB500220 HEAD GASKET 1.59mm 3 HOLE 200/300 TDI
LVB500230 HEAD GASKET 1.69mm 4 HOLE 200/300 TDI
 
hi there new to this site just had my gasket done and my father (**** hot mechanic at 64 time served you should be) told me you need the thickest one get the head skimmed fit the thickest as as theres so much compreassion they just blow i think mine got the three dots one i didnt know there was 4
 
sexydaz said:
hi there new to this site just had my gasket done and my father (**** hot mechanic at 64 time served you should be) told me you need the thickest one get the head skimmed fit the thickest as as theres so much compreassion they just blow i think mine got the three dots one i didnt know there was 4
Click to expand...
By that age he really ought to know better,to select the CORRECT head gasket measure the 4 piston protusions and select from the chart,skimming the head has nothing to do with compression ratio,just maintaining the correct bump clearance.
 
eightinavee said:
By that age he really ought to know better,to select the CORRECT head gasket measure the 4 piston protusions and select from the chart,skimming the head has nothing to do with compression ratio,just maintaining the correct bump clearance.
Click to expand...

Incorrect...... Skimming the head will mean reducing the clearance of the top of the piston with the top of the head chamber, this in turn will increase the compression ratio. So if you do have your head skimmed then you must replace that lost metal with a slightly thicker gasket to bring your compression back.
 
Simon72 said:
Incorrect...... Skimming the head will mean reducing the clearance of the top of the piston with the top of the head chamber, this in turn will increase the compression ratio. So if you do have your head skimmed then you must replace that lost metal with a slightly thicker gasket to bring your compression back.
Click to expand...

Is it not a flat head, most dervs have the swirl chamber in the pistons and not the head. Aint had one off so dunt know.

But if it's flat then you can skim it all day, if you went mad of course you would have to cut the valve seats down.
 
eightinavee said:
By that age he really ought to know better,to select the CORRECT head gasket measure the 4 piston protusions and select from the chart,skimming the head has nothing to do with compression ratio,just maintaining the correct bump clearance.
Click to expand...

He will fook up the compression ratio wif a thick one tho, or stick a thin one on and smash the valves.

Must be an old old mechanic, tut tut. Kick ees arse.
 
Simon72 said:
I stand corrected, forgot it was a Diesel, I was thinking of a Petrol that has the concave section in the head. :(
Click to expand...

Yel need ta stand in the corner wif the pointy hat fur 5 minutes, and 50 lines.

Diesel, no. Petrol, yes.

And the next time a note ter yer mum.
 
Sorry to jump in on the thread but is a head gasket a big job to do on a 300 TDi and how much should it cost through a garage.??
 
johng990 said:
Sorry to jump in on the thread but is a head gasket a big job to do on a 300 TDi and how much should it cost through a garage.??
Click to expand...

That's what threads are for chapie.

No it's not hard to do, a few tools including a torque wrench, which aint expensive and worth having.

Drain the water down or it ****es into the engine, and save it to put back in.

Take the manafold bolts off and lift the head off leaving them behind with the turbo.

See if you can get a couple of head bolts cut the heads off them, put a screwdriver slot in them and use them screwed into the block as dummy studs. This holds the gasket in place and you simply slip the head on and then screw them out.

When the head is off get a steel ruller and make sure the head is flat, corner to corner end to end and so on, if there is gaps then get it skimmed.

Now I think the 300 is angle torqued, this meens you torque it to a preload then turn it a certain amount of degrees. But although it sounds technical, you dont need an angle torque, once preloaded, mark all the bolt heads with a tippex mark then turn them until you get the incriments you need, 360 degrees in a circle so 90, quarter turn 180, half turn and so on.

Probably a couple of hours work at what ever rate 80 quid an hour plus parts.

Dont clean the block or head with anything more agressive than imery tape, no sand paper, or 40 grit stuff, it sends the grit down the engine, no no.

Dont be tempted to clean the pistons unless they are well carboned up and even then stay well away from the edges, leave the carbon on these parts, you fook up the seal if you clean it off

Hope that helps.
 
david451 said:
That's what threads are for chapie.

No it's not hard to do, a few tools including a torque wrench, which aint expensive and worth having.

Drain the water down or it ****es into the engine, and save it to put back in.

Take the manafold bolts off and lift the head off leaving them behind with the turbo.

See if you can get a couple of head bolts cut the heads off them, put a screwdriver slot in them and use them screwed into the block as dummy studs. This holds the gasket in place and you simply slip the head on and then screw them out.

When the head is off get a steel ruller and make sure the head is flat, corner to corner end to end and so on, if there is gaps then get it skimmed.

Now I think the 300 is angle torqued, this meens you torque it to a preload then turn it a certain amount of degrees. But although it sounds technical, you dont need an angle torque, once preloaded, mark all the bolt heads with a tippex mark then turn them until you get the incriments you need, 360 degrees in a circle so 90, quarter turn 180, half turn and so on.

Probably a couple of hours work at what ever rate 80 quid an hour plus parts.

Dont clean the block or head with anything more agressive than imery tape, no sand paper, or 40 grit stuff, it sends the grit down the engine, no no.

Dont be tempted to clean the pistons unless they are well carboned up and even then stay well away from the edges, leave the carbon on these parts, you fook up the seal if you clean it off

Hope that helps.
Click to expand...

Im looking at doing my head geasket myself! is it really that simple?? what about timing chain etc??
 
head skim wont make any difference on the 300 head, its flat compression will be affected with gasket choice though. thats why you should get the right one. did mine about 3 months ago and took about 2 hours in total.
 
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