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Old 05-10-2016, 10:35 AM   #61
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Thanks guys, ordered part from Geno's.

The O-rings look like the did when I installed them. The previous leak was intermittent, which makes me think it was never an o-ring problem. Now it pours out like a faucet, just hard to understand why?

New part MUST solve problem? I need to fix oil leak and then onto the old expansion bottle leak I had forgotten about
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Old 05-10-2016, 11:15 AM   #62
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I HATE mystery leaks...and electrical shorts. Good luck with it Dred.
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Old 05-10-2016, 12:38 PM   #63
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I HATE mystery leaks...and electrical shorts. Good luck with it Dred.
Lucky for me I am stuck in paradise, deciding whether to fix up a bus or go sailing
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Old 05-10-2016, 01:03 PM   #64
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Expansion bottle leak...Oh yea.

I spent most of yesterday repairing mine. It's officially called a deaeration tank, pn 1769488. Available for about $300 new.
I plastic welded a small leak. A quick road test shows success....
The leak only occurs under pressure and at full op. temp and then goes away at the slightest pressure drop.

BEEN MAKING ME NUTS trying to find the exact source, but I have now located it. I plan to replace went I get the best price.
If you look inside this thing you can see why it's so pricey...Not just an empty tank, lots of chambers and baffles and stuff in there.

The pic shows it upside down from it's in service orientation.

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Old 05-10-2016, 07:17 PM   #65
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The pic shows it upside down from it's in service orientation.
How did you extract yours?

What plastic weld did you use?
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Old 05-10-2016, 07:47 PM   #66
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How I did it. (With appologies to Young Fankenstein)

Tools I used: 9/16 socket on 3/8 ratchet with a 6in ext. Tools to loosen hose clamps.

Extraction: Drain rad. down by about 2 gallons (I loosened the bottom hose*) Engine side....Rem. the top end only of the hose from bottom of rad. to tank*. Rem. the coolant level wires. Rem. the top of the top rad hose. Rem. the small hose at the tank end. Rem. 2 3/8in. bolts from the tank holder frame. (Hard to see)

Under the front access cover...Remove the rad. end of small hose that connects the tank to the rad. top. Rem. 3- 3/8in. bolts holding the forward tank holder frame.

Back to eng. side, fold the upper rad. hose over (or rem. from engine) and carefully pull out the tank and frame assy.

I could NOT see the leak when the tank was cool and empty so I heat welded the tank all around the suspect area. I used an inexpensive plastic welder that uses only heat...Like a soldering gun with a wide, flat tip. I have a lot of experience with this little welder, it can do a good job if you take your time and follow inst.

Very similar to this:


I just ran the welder over the area, 1/2 lapping the previous pass until I covered all I thought I needed to, using no filler. So far it's holding
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Old 05-10-2016, 09:15 PM   #67
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so the tank comes out the front or from the inside?

I used some JB weld to stem the flow....stick pretty good to everything but the hole
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Old 05-10-2016, 09:21 PM   #68
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"Back to eng. side, fold the upper rad. hose over (or rem. from engine) and carefully pull out the tank and frame assy."

Inside/engine side.
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Old 06-30-2016, 09:23 PM   #69
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so I stopped in Buffalo WY to grab a biscuit before heading over the pass, and 1/2 quart was on the ground as I came back to the bus. That was Sunday

Picked up the bus today - $2600 repair(pulled the whole front of the bus and engine to get to the leaking gasket)

Then rolled out ecstatic to be moving again. Got just outside of Billings, and saw my oil pressure was below 30 rolling down the interstate. Pulled off, checked the oil - NONE! After topping it off less than 150 miles back, WTF?

Now I crawled into Billings, smoke billowing, no power - I am screwed I know it, just looking for options?
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Old 06-30-2016, 10:07 PM   #70
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Originally Posted by dredman View Post
so I stopped in Buffalo WY to grab a biscuit before heading over the pass, and 1/2 quart was on the ground as I came back to the bus. That was Sunday

Picked up the bus today - $2600 repair(pulled the whole front of the bus and engine to get to the leaking gasket)

Then rolled out ecstatic to be moving again. Got just outside of Billings, and saw my oil pressure was below 30 rolling down the interstate. Pulled off, checked the oil - NONE! After topping it off less than 150 miles back, WTF?

Now I crawled into Billings, smoke billowing, no power - I am screwed I know it, just looking for options?
... ... ... You ... don't have a failed turbo, do you? Would certainly account for (1) missing oil, (2) billowing smoke, and (3) no power. Oil could possibly be in the tube going from turbo to air intercooler (has this happen on a Volvo w/ ISX Cummins), if it didn't go out the exhaust.
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