Gasket surface repairs

[komatias]

HI guys,

this is for the advanced lads within the ranks... I sent my spare F650gs engine to the acid bath to remove the paint. The prick there must have sand blasted the poor thing after the acid so now my head gasket surface is not the smooth mirror finish anymore

Any tips on how best to polish this up without ruining the tolerances? I thought of autosol or some diamond paste but I doubt that will take up the surface roughness.

Cheers


George

 

[Loiq]

heard of a bloke doing a bush repair with a big wetstone (must be brand new so it's square) to a V8 landrover took it down bit just a nats. put it back together and seems fine.

 

[Womble]

You're probably best off sending it to a machine shop and getting it skimmed.

You might even persuade the acid bath guys to pay for some or all of the cost, but just don't fall for their offer of paying you in cash, late on a Friday night

 

[GUZZZI]

Gasket face repair

Hi, Theres always the old fasioned way, Lapping paste on a sheet of glass.
Takes a bit of patience mind, but very little expense.

 

[Fanum]

You're probably best off sending it to a machine shop and getting it skimmed.

Should only cost about £20 and they'll only take off the bare minimum they have to to get the result......so no more than you'd take off with any other method.

You'll also know it's done properly and it'll be dead flat

 

[Womble]

I meant to mention that, not only will the machine shop get the head flat and clean again, the finish will also be level. Getting the face level by hand would be pretty difficult, and you're more likely to end up taking off more material than you actually intended.

I'm not sure just how much of a difference it actually makes, but it's worth bearing in mind.

 

[ELIMINATOR]

If it's perfectly flat, I wouldn't have thought it would matter. But if it was more than a glancing blast then you worries are probably founded.

 

[komatias]

So.. I went and took a rag and some autosol to buff up the surface abit. at first glance it seems deep and yes just like shot blasting. The bloke assured me it wasnt shot blasted or anything so my concern is that it might have pitted in the two weeks I haven't had it in my possession.

To test this I took the old dremel out with the cotton wheel and buffed up the surface.. this revealed that the pits are very sporadic which would mean that it is corrosion I am seriously pissed about this but can do nothing.

Machine shop seems the way to go for the moment.