Still can't fix 450 diesel

jhncp · Jan 23, 2020

All cylinders except #1 seem to be sealed.
With injector out I put compressed air into
#1 cylinder and easily bubbles. The part I
can't understand now is after experimenting
at various levels it still seems to bubble
with the anti freeze being about an inch
below head gasket. I have the thermostat
casting/hose off, and looking down that hole
it appears to be an inch below head gasket.
Next I guess I'll take the side cover off by
injection pump and I have a Bosch inspection
camera but may be hard to detect leak
without antifreeze. Ideas?

Janicholson · Jan 23, 2020

Diesels can have either pin holes, or cracks in a sleeve below the mating surface. If you reverse the process, and put 7 psi in the cooling system you might find the leak by watching inside the cylinder to detect where the coolant is getting in. Another way (if the head is off) is to make a clear plexiglass plate of 3/8 thick material that can be bolted to the offending cylinder with head bolts Put an air fitting in the plate to pressurize the cylinder. With coolant (or water) in the block up to the deck, a lower leak will be obvious. Jim

jhncp · Jan 24, 2020

There is a crack in the sleeve under the flange (east and west). Of course I can see why this happened, from the head butting up against fire dam on sleeve and torquing it down on it and the counter bore in parent bore is screwed up from being double sleeved. The sleeve standout is good though. It's hard to believe air could be leaking thru the crack with it pressed down tight and then be able to bubble into water . I still don't know if it's just head gasket . If I tried the plexi glass it would have to cover all the cylinders in order to have pressure in jacket

used red MN · Jan 24, 2020

You could try just covering that cylinder with the plexiglass with a hole to pull a vacuum on it with a wet vac. Seal it with a cut piece of inner tube or buy an oring. Clamp down with pipes on studs maybe even heavier wall PVC would work.

Janicholson · Jan 24, 2020

Putting air pressure into the cylinder by drilling a hole in the plexi glass and threading in an air chuck Control air pressure to 30 psi or so. Jim

used red MN · Jan 24, 2020

Oh and if you try this you should find some way to lock the engine from rotating. If it is in the tractor put it in 5th with the TA forward and lock the brakes. Or cut a piece of wood to put in cylinder 4 and hold it down with washers on the studs.

jhncp · Jan 24, 2020

Thanks. If I want to try pressuring that water jacket and have plexi glass on #1, any bright easy ideas how to plug rest of holes?

Janicholson · Jan 24, 2020

If the plexi glass is only over the one cylinder and only covering the round part, and you only put air into the center of the plexi glass the air pressure will be captured in the same way combustion gasses are trapped. it might push the piston down but that makes no difference, the air will bubble out of the surrounding liquid and be visible in the holse next to or through the plexi. Jim

jhncp · Jan 24, 2020

I took side cover off and I can see one hole where block and head meet and don't feel leak. Unfortanatley from looking at pics taking waterpump wont expose much of the water jacket ah?

rustred · Jan 25, 2020

I know a person wants to diagnose the problem first. But it appears you have a general idea where this leak is. So disassembly might be the answer now. Has this engine had engine work done to it recently ? Once things are apart can see where leak exists.

Bob · Jan 25, 2020

Take it apart (it HAS to come apart, no matter what, to be repaired) and take the block to a machine shop equipped to pressure test it for leaks.

Still can't fix 450 diesel

jhncp

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Janicholson

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jhncp

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used red MN

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Janicholson

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used red MN

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jhncp

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Janicholson

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jhncp

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rustred

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Bob

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