help please
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From: Hope,in
help please
i have a 1990 ford f350 with a 7.3 diesel that is jumk, it has an a4od trans, what gas engine will bolt to that tranny, i would like to convert it over to a 302 or something, thought about 460 but i need some kind of fuel economy
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From: Hope,in
and the cost of diesel fuel is going nuts again, and the cost of replacing the engine is nuts too, i cant even find a rebuildable core for less than 500 bucks then all the money it takes to build it and get it together is just plain nuts, i like diesels but the cost is getting dumb
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From: Des Moines
Well, for one, there is a 6.9 diesel on E-bay listed for $750. In Michigan. Bad oil cooler, but if your's on the 7.3 is good, it is a direct swap.
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Post Fiend
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From: Nutter Fort, WV
Your problem might also be bad oil cooler O rings.
Were the head gaskets changed because of water in the oil?
Were the head gaskets changed because of water in the oil?
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From: Des Moines
Yank the cylinder heads. Block off coolant passages (I try to use something like a steel strip with an old inner tube chunk, held down by bolts in the head-bolt holes. Hard to describe without being there.) Plug lower radiator hose, fill block with as hot water as possible, put about 15 lbs. pressure in upper radiator hose (after draining oil) and look to see if water is coming out of oil drain hole. This would indicate a bad block (cavitation or cracked) Have heads checked for cracks if block holds pressure. About 3-6 hours to check a block this way, other than being a pain-in-the-rear from the heavy cylinder heads and wrestling them around. Plus, making some steel strips to hold the rubber in place.
Done it several times, just not on a 6.9 or 7.3 block.
Done it several times, just not on a 6.9 or 7.3 block.
Post Fiend
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From: Nutter Fort, WV
Make an air hose adapter that screws into a glow plug hole.
Now fill the radiator completely full of water.
Remove a glow plug and put shop air pressure in a cylinder, watch the water in the radiator.
If there are no bubbles or the water level does not raise, move to the next cylinder.
CAUTION, the engine will turn over till that piston is at BDC when you apply air, so expect that and watch your air hose and fingers are not near the belts when you put the air pressure to each cylinder.
If the intake or exhaust valve is open, you may not get the engine to roll to BDC.
Pull the rocker covers and loosen the rockers will have all of the valves closed and make this test faster.
If you do all of the cylinders and do not have water level increasing or bubbles in the radiator, suspect the oil cooler O rings next.
If you do have rising water when air is applied to a cylinder, you now know exactly where to focus your attention whan you pull a head.
PS with the piston at BDC, you are testing the head, head gasket, piston and the complete cylinder wall.
So cracked blocks, cracked heads, blown head gaskets and cavitation all show up with this test.
Now fill the radiator completely full of water.
Remove a glow plug and put shop air pressure in a cylinder, watch the water in the radiator.
If there are no bubbles or the water level does not raise, move to the next cylinder.
CAUTION, the engine will turn over till that piston is at BDC when you apply air, so expect that and watch your air hose and fingers are not near the belts when you put the air pressure to each cylinder.
If the intake or exhaust valve is open, you may not get the engine to roll to BDC.
Pull the rocker covers and loosen the rockers will have all of the valves closed and make this test faster.
If you do all of the cylinders and do not have water level increasing or bubbles in the radiator, suspect the oil cooler O rings next.
If you do have rising water when air is applied to a cylinder, you now know exactly where to focus your attention whan you pull a head.
PS with the piston at BDC, you are testing the head, head gasket, piston and the complete cylinder wall.
So cracked blocks, cracked heads, blown head gaskets and cavitation all show up with this test.
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