Technical Inlet Manifold problem?

[RS-1989]

Hey, i was takeing the head off my cinq today to replace the head gasket, and came across this on the inlet manifold

Now thiis is the first time ive gone into the engine so ive never seen the inerds before, so is that orange stuff supposed to be there?

also if the head gasket has gone, should i be looking for any thing on the top of the block?

Thanks

 

[Brooky]

Ive found that one most inlets. IIRC there no hole on the head side for the water to flow through, so it just clogs up.

I just clean them out and give it a good washing through.

 

[rallycinq]

Now thiis is the first time ive gone into the engine so ive never seen the inerds before, so is that orange stuff supposed to be there?

Nope, that looks like instant gasket gumming up the water way in the manifold.

also if the head gasket has gone, should i be looking for any thing on the top of the block?

Just make sure there are no erosion marks, although they are more likely on the head.

Cheers

Gormless Cretin

 

[RS-1989]

Just make sure there are no erosion marks, although they are more likely on the head.

Cheers

Gormless Cretin

Thanks, i think i cought it early, there was a slight rip between two of the channels on the gasket, so im hopeing theyll not be mutch damage.

If the tops of the pistons have been cleaned round the edges this means that theres been water there right?

P.S Would the clogged up bit in the inlet manifold cause a bit of a lumpy idle?

Thanks

 

[rallycinq]

Thanks, i think i cought it early, there was a slight rip between two of the channels on the gasket, so im hopeing theyll not be mutch damage.

If the tops of the pistons have been cleaned round the edges this means that theres been water there right?

Thanks

Correct, in one.

Cheers

Gormless Cretin

 

[RS-1989]

Thought so, asked my dad but he just said, 'last time i did anything like that i wasnt married and was on my 15th mini' so i just said you forgot then

Anybody tried a port polish on one? my mates done it to his car and i thought i might as well seeing its appart. Hard job?

 

[fingers99]

Polishing doesn't do any good at all. You can get in there and clean up the casting a little with a rotary burr, little sanding drums and so on, but you don't want a mirror finish at all -- something equivalent to the finish of 400 - 600 grit wet or dry will be good. And don't go nuts, just matching the gasket and taking out any ridges will be fine (you inlet mani could certainly use that). Be very, very careful not to contact the valve seats with the chuck (put a sleeve over it if you can). It's a surprisingly dirty job: wear a mask.

More important, skim the head, re-cut the valves, fit new valve oil seals, check the valve clearances.

 

[arc]

that gunk is normal. that is a blanked off waterway. look at the attached image, you can see the actual waterway and then the gunked up one as well.

 

[rallycinq]

that gunk is normal. that is a blanked off waterway. look at the attached image, you can see the actual waterway and then the gunked up one as well.

Ah, I thought it looked to be on the wrong side, but couldn't see the other side to check.

Cheers

Gormless Cretin

 

[arc]

Anybody tried a port polish on one? my mates done it to his car and i thought i might as well seeing its appart. Hard job?

my old SPI manifold (ported to the gasket size) vs a stock one.

 

[Italian Coke Can]

Above manifold is still sat in my garage if any one wants to try Arc's handi-work . . . hint hint . .

 

[arc]

Blackpool Road and Rally's handy work on that one

 

[RS-1989]

Ah right, thinking of having a go at porting the inlet now, what tools do i need to use to do it? A dremel multi tool thing i take it, but what bit?

And whats the best way to get the texture back on the inlet? As said above i dont want it smooth so just some sand paper or wet and dry? if so what grade?

Thanks

 

[fingers99]

You want to use a thing called a rotary burr these look OK -- ordinary grinding bits just clog. Coat it with something like a candle to stop it clogging up all the time. After that, little sanding drums. You can hand finish the rest if you like. No polishing, just nice and smooth.

Wear a mask -- aluminium dust may cause Alziemers.

See if there's anything on the FROST site, too.

Personally, having blown up 2 dremels on bike heads, I'd use a battery powered electric drill for the removal of the bulk of it.

Like I said, no point in doing all that unless the valves are sealing properly and the shimming is correct.

 

[RS-1989]

You want to use a thing called a rotary burr

these look OK -- ordinary grinding bits just clog. Coat it with something like a candle to stop it clogging up all the time. After that, little sanding drums. You can hand finish the rest if you like. No polishing, just nice and smooth.

Wear a mask -- aluminium dust may cause Alziemers.

See if there's anything on the FROST site, too.

Personally, having blown up 2 dremels on bike heads, I'd use a battery powered electric drill for the removal of the bulk of it.

Like I said, no point in doing all that unless the valves are sealing properly and the shimming is correct.

Ahh right my dad has a few of them about here i think, ill ask. Ill make shure not to polish them then

Ive checked the clearances today there all ok, and ill get on with the rest of it tomorow now probably.

Thanks