Promax block crack ???

[tlwjkw]

good man... reason I asked once I had a shop call to tell me they had cracked it on one side when they attached it to a fixture.. fixed it and put a weld on other side.. also good folks...

[TEXAS20225]

JIm ruck did this to two of my 225 pmax blocks and james fixed one for me with the leg to support it i have seen them do the same thing on 200 efi blocks not too often but still required welding up im am thinking its produced by over tightening back two nuts also

[roadkill636]

I'm still looking for the question that was asked in the 1st post... is there a water passage that this crack is near or in that will let water get into the exhaust chest and somehow get into the bottom cylinder?.

The motor has been running the past 9 years the owner stated.

I dont want to tare down the ph if it's just cosmetic and not going to hurt anything more staying like this

[Hydrodreams]

Pulling mine down now. Never rebuilt 1997 ProMax with a bunch of hours. Has a crack in the same spot on the port side.


I will upload a picture later. Not close to a water passage for the above post. Just a thin spot in the block and you can see where mine has been exhausting through the crack.

[tlwjkw]

I'm still looking for the question that was asked in the 1st post... is there a water passage that this crack is near or in that will let water get into the exhaust chest and somehow get into the bottom cylinder?.

The motor has been running the past 9 years the owner stated.

I dont want to tare down the ph if it's just cosmetic and not going to hurt anything more staying like this

I've never seen it cause a problem with water stuff... but there is always a "first" with merc………………..

Bobby, have ya closed up shop?.. ya "new ta me" fancy gate always closed?...…….

[tux974]

This has been going on for a long time the 245/260 blocks were also notorious for cracking back there. Hence why long studs were introduced.
The 2 factors I have found to be the culprit are, removing the power head improperly and not using enough studs when using/installing to a fixture.
Roadkill, Never seen it affect water passage.

[Dave S]

Just buy Yammi.....

[Hydrodreams]

Here is the crack in my block..

[Dave S]

Not sure.... if Promaxk.... HeeHee......does.... twinnn gasket with a pan..... but that could.......if not....

[Dave S]

And...... Why...... do L6 Mercs have Cracks.... on the..... transfer hole........V6.... 150 and all....have cracks on the exhaust web??????Speek to Me Scotty......More power th tha front blasters.....silly bunny....Harminicks.......Sorry for the fact that I don't spell.....

[tux974]

Hydro, I say that needs to be welded.

Dave,
Yes PM's have Hi-Perf double gaskets with either pan plate, old style and alien.
Yes, also common V6's have hair line cracks in exhaust web.

[Dave Strong]

Hydro, I say that needs to be welded.

Dave,
Yes PM's have Hi-Perf double gaskets with either pan plate, old style and alien.
Yes, also common V6's have hair line cracks in exhaust web.

Almost looks like a casting void that cracked??

Dave

[tux974]

Almost looks like a casting void that cracked??

Dave

Dave Yes, and only can be seen with plate off.
That area even on a good casted block is very thin.

[Merc 2.5]

Here is the crack in my block..

One of these pics looks like it could have been losing sum exhaust. from the coloring neway

[roadkill636]

My plug on top of the block is blank. I thought all Mercs had their numbers stamped in there. What's up with this one?