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Unread 10-17-2013, 02:31 PM   #1
ChaseKanter
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Join Date: Apr 2013
Location: Lincoln, Nebraska
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Help- installed HV Melling oil pump now shortage of power.

Hi guys, I installed a Melling High Volume oil pump last weekend and it was finally warm enough today to take out the jeep. Now it feels like it has less power and starts to backfire/die when i give it throttle in 3rd.

Is the HV pump really putting that much stress on my engine?

I also switched to Rotella 15w40 deisel oil. Could the thickeness of the oil be causing stress on the pump and stressing the engine?

Here are my Jeep details.

Model/year: 1978 CJ5
Transmission: t150
Engine: 258
Oil: rotella 15w40 deisel
Oil filter: wix
Original carb (has always worked great)

It is not overheating and the oil pressure is good (15 at hot idle and 30-50 driving)

The only thing that has changed is the oil, filter and the pump. Should i switch back to a thinner oil? Any suggestions would be appreciated.

Here she is....

image-3810375513.jpg

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Unread 10-17-2013, 02:38 PM   #2
ChaseKanter
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Forgot to mention, the PO installed the "Team Rush" upgrade. So it does not have the original distributor. Not sure if that matters or not.
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Unread 10-17-2013, 03:16 PM   #3
gmakra
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Look for something you might have knocked off or didnt re install properly. Such as a vacuum hose or wire.
A oil pump should not cause those symptoms unless you have a really badly stretched timing chain.
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Unread 10-17-2013, 05:40 PM   #4
lucdog
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1980 CJ5 
 
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Quote:
Originally Posted by ChaseKanter
Forgot to mention, the PO installed the "Team Rush" upgrade. So it does not have the original distributor. Not sure if that matters or not.
The TeamRush uses the orignal distributor, the only thing that gets changed is the wires, rotor, cap, and the cap adapter. ( the cap adapter is the part between where the wires plug into, and the distributor).

B
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Unread 10-17-2013, 05:51 PM   #5
petey156
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True. Unless, he had the presto lite ignition...
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Unread 10-17-2013, 06:01 PM   #6
hp_lovecraft
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Those are symptoms of either a bad vac leak, or bad timing. If you had an ignition system change, I'd check the timing first. Then make sure the vac advance is hooked up. Then start checking that all the hoses are attached, etc.
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Unread 10-17-2013, 06:45 PM   #7
ChaseKanter
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Sorry for wasting your time guys. It just happened that the corroded rubber fuel line finally gave way at the same time i replaced the oil pump... I replaced the hose and it is back to normal. Thanks for the help though. This forum is awesome..
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