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post #1 of (permalink) Old 08-25-2002, 08:46 AM Thread Starter
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304/changing oil pump- whats involved?

Whats involved in changing the oil pump? any special tools or parts needed? it seems like a simple procedure.
is there anything else i should do while the pan is dropped?
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post #2 of (permalink) Old 08-25-2002, 10:19 AM
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Re: 304/changing oil pump- whats involved?

a 304 oil pump is not inside the pan..its even easier!

its bolted to the timing cover (front of engine)

unbolt the cover ( flat plate near oil filter), slide the geatrs out, lube new gears well, slide them in, bolt cover on with new gasket. done

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post #3 of (permalink) Old 08-25-2002, 03:24 PM Thread Starter
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Re: 304/changing oil pump- whats involved?

excellent. that does make it easier.
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post #4 of (permalink) Old 08-25-2002, 06:08 PM
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Re: 304/changing oil pump- whats involved?

Just a word of caution, do not use a heavy gear lube, white lithium grease is what you should use and pack it in good around the gears. When you crank the motor the lithium grease is light enough for the oil to push through and it will prime the pump for you as the motor cranks over.
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post #5 of (permalink) Old 08-25-2002, 07:43 PM
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Re: 304/changing oil pump- whats involved?

Just curious, why are you changing the oil pump gears? The gears rarely have any problems. If you think it will help the oil pressure, it's not going to make a difference. The pump housing is part of the aluminum timing cover and the only way to replace that is to buy a new $250 timing cover.
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post #6 of (permalink) Old 08-25-2002, 10:13 PM
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Re: 304/changing oil pump- whats involved?

According to the AMC engine guys I have talked to if your oil pump housing is using too thick of a gasket swapping out for a thinner gasket can help out alot in raising the pressure if you are getting low readings and think the housing may be worn.
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post #7 of (permalink) Old 08-26-2002, 06:49 AM
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Re: 304/changing oil pump- whats involved?

I'll chime in and "ditto" Will's statement. My first engine had low oil pressure....REAL low. I replaced the pump (gears) and sanded the cover down on a piece of glass (it was grooved pretty bad). While it did give me 5#s at idle, it was a complete waste of time & $$ due to the wornout main/cam bearings, & general poor condition of everything else. You _MIGHT_ get a few more pounds out of it, but it'll never "fix" the real problem.
My current engine is a fresh rebuild out of a CJ. It has 60# cold idle, 70+# above 1000rpm, and about 35-40# at warm idle.
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post #8 of (permalink) Old 08-26-2002, 07:18 AM
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Re: 304/changing oil pump- whats involved?

after reading your OITYHER post n how the oil pressure went to zero, and started knocking badly, your probably wasting the $20 and time to replace the oil pump.

I think your gonn have more serious probs, BUT the above statements about the gears alone making an increase in pressure is generally true, they usually arent the primary wear item.

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post #9 of (permalink) Old 08-26-2002, 07:12 PM Thread Starter
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Re: 304/changing oil pump- whats involved?

ok. i understand. this engine never had good pressure to start with, at least none that i ever knew of.
i don't know what to do. Why would the tapping come and go at times? I would love to have a fresh engine. Someday i guess. I not going to invest any $$ in this ol' 304. not worth it to me.

Thanks for your help...
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