These dam engines again

[waynes world]

Ok this is the ........ forgot now how many times i have had trouble with sorting these engines out, but got four engines here haha

This is the block i had sent for a rebore and skim, being a VP AQ130 B20 block.

It came to me like this, rebore seems ok, i say `seems` as the head is not good IMO.




i am going to call the machine shop in te morning but i need to know if there is a max amount to be skimmed off these block before piston inteferance.

I got no call from them before, during or after but for a call that its done.

I just need to know what to ask/say to them and know what the max is that can be taken off the block.

these things are real peeeeing me off now with folk doing stuff for me. if my milling machine was big enough i would do it myself.

 

[Boater Sam]

They were probably taking off the bare minimum just in case. I would not worry too much about the remaining rust pitting, a smear of Hylomar should ensure that you get a satisfactory seal.
The bore and honing looks good providing the size is correct.

 

[waynes world]

They were probably taking off the bare minimum just in case. I would not worry too much about the remaining rust pitting, a smear of Hylomar should ensure that you get a satisfactory seal.
The bore and honing looks good providing the size is correct.

i have been told i could fill with Stag Wellseal Jointing Compound. I have JB Hi temp epoxy aswell.

I would of thought they would of said something as it looks terrible.

 

[penfold]

I'd expect a chat on the phone or an email about it; that looks bloody awful.

 

[harvey38]

I hope the rebore is better than than the skim

 

[KevinV]

[Deleted quoted content removed]

Get a life, and learn some manners

As for the OP, I'd be questioning that skim, even if only to ask why they stopped there

 

[waynes world]

[Deleted quoted content removed]

i am a nice bloke to an extent, but when it comes to morons.........do one over the bow

Get a life, and learn some manners

As for the OP, I'd be questioning that skim, even if only to ask why they stopped there

I am just rebuilding the bottom end to see how much clearance there is for the valves etc. just having a brew and going to get a new ring compressor and finis then ill call them.

 

[harvey38]

i am a nice bloke to an extent, but when it comes to morons.........do one over the bow



I am just rebuilding the bottom end to see how much clearance there is for the valves etc. just having a brew and going to get a new ring compressor and finis then ill call them.

Maybe they were concerned about raising the compression rate too much, I'm sure a phone call will clarify with hopefully a positive resolution

 

[Praxinoscope]

Looking at the photo's I would certainly question the machine shop over the skim, it may be that they have skimmed the maximum safe amount, but at least it's worth checking. As others have said the bores look good.

 

[lustyd]

[Deleted quoted content removed]

Both are in widespread use and either are acceptable, unlike acting like that on forums. Be nice.

 

[PaulRainbow]

I would not use the block in that condition. The suggestion of bodging it back together with Hylomar should be avoided at all costs.

The correct solution would be to skim the head properly and then to skim an appropriate amount from the tops of the pistons.

 

[Paul1962]

The skim would not be acceptable to me. If the compression ratio is raised too much by skimming the head correctly, would it be possible to use two head gaskets?

I seem to recall this has been done before.

 

[PCUK]

I've done it successfully before but it resulted in lowered compression and power. However if the block was reskimmed to make it good then the extra gasket may do the trick without loss of power. Needs some careful measuring and calculations.

 

[waynes world]

well before i called them i put a piston in to see, and it has maybe 2thou to go for skimming.

I called them and they said it was max they could do before scrapping the block. When i mentioned nothing was said to me before collection or why it was not skimmed first, apparently you have to rebore first then skim. Cant argue with that as i dont know if thats correct.

So as it is i can either use as is, or fill the low spots with JB Hi temp weld or Stag Wellseal Jointing Compound.

 

[waynes world]

I've done it successfully before but it resulted in lowered compression and power. However if the block was reskimmed to make it good then the extra gasket may do the trick without loss of power. Needs some careful measuring and calculations.

the standard gasket is ,8mm next up is 1.2mm. so the way it is wit the standard is .8mm clearance then. If i got it skimmed .4mm more, i know more than enough it would bring the height back to .8mm clearance with a 1.2mm gasket.

 

[waynes world]

ok sod it. i have this all ready and its what it is for.

HighHeat Epoxy Putty

 

[rotrax]

The skim would not be acceptable to me. If the compression ratio is raised too much by skimming the head correctly, would it be possible to use two head gaskets?

I seem to recall this has been done before.

See post #11.

Paul Rainbow gives the answer simply and objectivly.

Ten thou off of the block/head interface, ten thou off the piston crown. The engine is already in bits-chucking the pistons in a big lathe and turning a bit off is a doodle.

Nothing special about Volvo pistons.

The one I pulled in bits a few years ago had the piston crown level with the block at TDC. It was the first time it had been stripped.

Have the block skimmed, measure the protusion, remove it.

Simples..........................................

 

[PaulRainbow]

ok sod it. i have this all ready and its what it is for.

HighHeat Epoxy Putty

Not what it's for. Not only does it have to withstand the heat, it may well have to withstand combustion pressures. You have the block stripped and bored, new pistons, why would you then bodge it with epoxy, it's madness.

If the engineering company think that block surface is OK, you need another engineering company.

The thread title is "

These dam engines again"​

Do it right this time to avoid the need to type that again