2H question

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stevek

stevek

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Sep 20, 2003
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Suffolk, VA
I just purchased an HJ47 with a very recently rebuilt (as in close to no miles on it) 2H. I really havent gotten much of a chance to fool around with the truck yet but I think I have found a major problem. I am spotting signs of either a blown headgasket or a cracked head/block.:crybaby: The liquid in my overflow tank is a very dark brown/black sludge color and the radiator cap is covered in a brown sludge. There is nothing abnormal on the oil fill cap and the oil level looks good on the dip stick, not milky although the level is a little low. Tomorrow I am planning on draining the oil and putting fresh in. I want to see how it handles the bubble test in the overflow bottle.

Is there any place beside the block/head where the cooling system and the oil system interact? There is an oil cooler on the side of the block but I can't see where there are any water passages that run through it. Could there be something simple I am missing?
 
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Is this sludge in the water oil ? It sounds like the sludge may be from the block or radiator? Was the motor standing a long time before the rebuild? It may pay to drain the radiator and reverse flush it and also drain the block and flush it also. You should be able to feel or see if the radiator water has any oil in it.
 
The sludge in the overflow bottle that I have pulled appears to be oil as far as I can tell. The sludge that I see under the radiator cap I am not sure of, it has more if a brown look to it. The truck has an oil leak coming from where the oil filter head attaches to the block. As I was cleaning that up (from around the filter, starter, and the surrounding area) tonight I am finding drops of antifreeze mixed in with the oil streaks. Its odd becase they are really just drops of green mixed in with the oil, its not milky.

I went ahead and started the truck. I dont see any abnormal smoke, just some white smoke on startup which I attribute to it being 40* outside. I put the overflow tube into a bottle of clear water and I get a pretty steady stream of bubbles.

The truck has sat for the better part of the year I would guess. The engine was rebuilt in June and hasn't been driven much as far as I know.
 
Sorry to hear your having these problems. Was it imported from oz?
 
Hi stevek!

Might be that your oil cooler has a crack. Mine did, the result was oil mixing with coolant, and sludge in the expansion tank. I also thought of a cracked head or so, but fortunately it was not.
 
Well, I found the oil leak. It looks like there is some sort of prefilter on top of my oil filter. It's not in any of the 2H manuals I have seen so I dont think its a Toyota part. Here are some pics, first of the leak (you can clearly see antifreeze) and a couple of the prefilter.
oilleak1.webp
oilleak2.webp
oilleak3.webp
 
This leads me to a couple of questions. Firstly, has anyone ever seen anything like that? It is coming off of the same filter head the Toyota filter is on which to me means its not a bypass filter, but who knows. Second, on the first picture I posted you can see a ring of green antifreeze around the Toyota oil filter. Is there a water passage or jacket somewhere in this area that could be leaking?
 
stevek said:
Is there a water passage or jacket somewhere in this area that could be leaking?
Click to expand...

The oil cooler case is in that neighbourhood. I think Vegard may have guessed it.

Im not sure if that can explain the bubbles in the coolant.
 
Bigbrowndog sent me a .pdf with the part numbers for the centrifigal filter.:cheers: I am missing a gasket near as I can tell. Now that I know where its coming from, I just need to figure out why there is coolant in the oil.

Thanks!
cenfilter.webp
 
As far as the bubbles in the overflow go, could that be a byproduct of now being low on coolant since there is a leak? When I take the radiator cap off air enters the system and when I put it back on the air that entered is being purged?
 
stevek said:
As far as the bubbles in the overflow go, could that be a byproduct of now being low on coolant since there is a leak? When I take the radiator cap off air enters the system and when I put it back on the air that entered is being purged?
Click to expand...

I doubt it ,air bubbles go upwards. When you take the cap off ,the air only sits in the upper tank or the highest part of the coolant systam.
If it has heater hoses or any hoses higher than the radiator you could remove them and fill the coolant through there.
This would guarantee all air is out of the coolant.

A hydrocarbon sniff test would tell if the bubbles are from a head gasket or cracked head.
Do the air bubbles get fast with engine speed?
 
Your arrow points to where the filterholder is attached. I never concidered wether coolant flows all the way out there, but don't think so. Oil goes through the cooler (the part to the left), through channels in the case, and to the filter. Coolant flows through the gallery, inside of the case.

My crack was where the oil pressure sender for the warning light was attached. The threads on the sender are conical, so tightening too much will crack the aluminium of the case.
 
to test if you have a head problem is to take the cap off and fill the radiator to the top so that the level is as high as it can get block off the hose going to the expansion tank then start the engine and get it to operating temp it is important to keep the level to the top of the radiator so that air can not enter the system and check for bubbles as you do in the other test that you did but by doing it this way is far more accurate i hope this helps
 
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