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Originally Posted by battle_cat
(Post 4328700)
I used the whole oiling system from the 1998 7.4 mpi. The oil lines are pretty Small. I think 3/8. I pulled the block numbers. It's a gen v 1992 merc 370 hp. The previous motor had no issues. So not cross contamination from cooler..going forward. I think if I install the 30 psi bypass in the block and take out the other bypass in the center hole ,use the bigger cooler and lines ,and install oil temp gauge...I should be good. Does this sound right?
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Never re-use an oil cooler period. The example you gave of how the motor was running fine and then dropped rpm and oil pressure is a classic example of re-using an oil cooler.
Chris |
OK.I will use new cooler lines filter and all. Should I use any bypass valve at all?
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And what's a good oil pump to buy. I won't use this one with all the crap that was in this motor. Or can they be cleaned?
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Originally Posted by battle_cat
(Post 4328716)
And what's a good oil pump to buy. I won't use this one with all the crap that was in this motor. Or can they be cleaned?
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Originally Posted by Blueabyss
(Post 4328711)
Never re-use an oil cooler period. The example you gave of how the motor was running fine and then dropped rpm and oil pressure is a classic example of re-using an oil cooler.
Chris |
Originally Posted by stimleck
(Post 4328910)
curious as to why not? also does the oil cooler effect oil pressure?
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Did you reverse the oil lines when you installed it on the new engine? If you did, it will cause exactly what you are describing. I learned this the hard way in my younger life and the new engine also had 10 hours on it. If you reverse them, no oil will flow through the cooler. Toss the existing cooler, I even tossed the all the oil lines when I did this.
Good luck, but you need to find out what caused it, so you don't repeat it. |
Originally Posted by 1BIGJIM
(Post 4328937)
Did you reverse the oil lines when you installed it on the new engine? If you did, it will cause exactly what you are describing. I learned this the hard way in my younger life and the new engine also had 10 hours on it. If you reverse them, no oil will flow through the cooler. Toss the existing cooler, I even tossed the all the oil lines when I did this.
Good luck, but you need to find out what caused it, so you don't repeat it. |
I've got a similar set up with a 502/500hp using the standard 454 Mag MPI stuff, and want to switch it out without pulling the motor if possible. There's a fair amount of room to reach under the sandwich adaptor so it should be possible to spin the OEM Merc unit off and replace it, right? The bypass valve was replaced but I'm not so sure that the one under the nipple was removed, so I'll try to reach under there and get it (Hex wrench, right?)
From what I can tell the billit relocator kits use 1/2" barbed lines with pipe threads? It also looks like the merc cooler uses flared fittings so a new larger cooler will be in the plan. I'm trying to gather as many parts as possible to minimize downtime and hair pulling, so any tips, tricks, and warnings are appreciated. |
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