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Old 05-28-2019, 11:48 AM   #1 (permalink)
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Rebuilt engine questions

Haven’t been on this site since 11 😱😱. Anyways I picked up a sweet cj7 with my son as a project. Has a freshly “rebuilt” amc 304. I have a few questions about oil psi and water temps on a motor that hasn’t been even broke in yet. Cold im getting 40 psi. Warm it settles to 8 or so. The temps run around 220-230. Is this normal or should I look into the oil pump and cooling system or break it in and see what happens?
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Old 05-28-2019, 12:34 PM   #2 (permalink)
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10psi per 1000 rpm as a rule of thumb. 8 psi warm seems very low. Cut the filter apart and look for metal.

My 304 never went that hot.
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Old 05-28-2019, 05:36 PM   #3 (permalink)
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It might be worthwhile to check timing (for the high temps). I had a SBC that was running hot, timing was way retarded causing high temps and loud exhaust and low power.
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Old 05-29-2019, 08:45 PM   #4 (permalink)
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http://theamcforum.com/forum/low-oil...opic38842.html

Some good info here. Seems to be somewhat common. Several people mention a worn timing cover and needing to check the clearance in the oil pump for this issue. I could see someone thatís not versed in AMC not knowing to replace or check the timing cover.


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Old 05-30-2019, 06:24 AM   #5 (permalink)
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The AMC 304 V8 is notorious for oil pressure problems. Here's a solution.

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Old 05-30-2019, 07:18 AM   #6 (permalink)
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Rockauto has Dorman timing cover kits.

Temperature:

Verify the temperature with another temp gauge or a hand held infra red thermometer. Might have a bad sender or gauge.

Make sure you are running a factory type fan shroud and a large 7 blade fan with a fan clutch that the CJs originally had. A cheap flex fan won't cut it. If it overheats at low speeds, especially.

Running hot at highway speeds or under load, might have a partially plugged radiator, too small radiator or one that the exterior fins are packed with dirt or otherwise not allowing a good heat transfer. If the reman block was not properly cleaned in the water jackets, loose crud can plug up a brand new radiator in minutes. If you live in a warm climate, I would recommend a three or four row radiator if you get a new one.
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Old 05-30-2019, 11:56 AM   #7 (permalink)
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does it still have the factory bypass hose from the water pump to the intake manifold?

which intake manifold does it have?

i'll try to find some of my old posts about AMC v-8 cooling systems and post links here

EDIT: i can't find any of my old posts...those forums must be gone now. answer my questions above and i'll respond with some info

EDIT II: Google found them:
https://www.pirate4x4.com/forum/jeep...ems-304-a.html
https://www.pirate4x4.com/forum/jeep...ng-401-yj.html
https://www.pirate4x4.com/forum/jeep...g-methods.html i posted info on pages 1 and 2 of this thread
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Last edited by jeepnmatt; 05-30-2019 at 12:10 PM.
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