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post #1 of (permalink) Old 04-08-2002, 10:10 PM Thread Starter
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Overheating problem

I just fired up my brand new 258 tonight. It runs great except for a little MSD problem (engine not shutting off) and it overheats.

When I got the new water pump from Checker I had a feeling that it wasn't right. It bolted up just fine except for one bolt did not fit properly and the heater hose was 5/8" not 3/4". Since it bolted up I thought it was right. Now I here there are two different water pumps that will bolt on to this engine. One is right one is wrong. Is this true?

Is there a way to test if the water pump is running correct? Is it worth it to get a high volume water pump? What temp thermostat should I be running?
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post #2 of (permalink) Old 04-08-2002, 10:50 PM
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Re: Overheating problem

You are right about 2 pumps, standard and reverse rotatation. V-belts typically use the standard rotation, serpentine uses the reverse. If you have the wrong pump, you are not getting flow.
post #3 of (permalink) Old 04-08-2002, 10:51 PM Thread Starter
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Re: Overheating problem

I think that is the problem. How can you tell for sure?
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post #4 of (permalink) Old 04-08-2002, 10:54 PM
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Re: Overheating problem

Direction the vanes face on the impeller. Take it to the parts store and compare it with the correct one.
post #5 of (permalink) Old 04-08-2002, 11:03 PM
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Re: Overheating problem

I am looking in my AMC factory service manual right now, and it tells me you will see the word "REV" cast into the pump.
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post #6 of (permalink) Old 04-08-2002, 11:33 PM
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Re: Overheating problem

<blockquote><font class="small">In reply to:</font><hr>

I am looking in my AMC factory service manual right now, and it tells me you will see the word "REV" cast into the pump.

<hr></blockquote>
Many aftermarket pumps don't have that, just the factory pump.
post #7 of (permalink) Old 04-09-2002, 12:15 AM
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Re: Overheating problem

I guess for an aftermarket pump, without the casting marks, one would have to check the direction of the impeller blades, seems to me , they would point opposite of a standard rotation pump?
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post #8 of (permalink) Old 04-09-2002, 10:24 AM Thread Starter
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Re: Overheating problem

IS a high volume pump worth the extra money?
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post #9 of (permalink) Old 04-09-2002, 10:28 AM
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Re: Overheating problem

The stock water pump should do just fine, except in extreme situations.

Just to answer your 2nd question, the thermostat on a 258 is a 195 degree.
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