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Old 05-29-2012, 05:56 PM
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Whats the best way to flush an engine??

just bought a 1988 chevy 1500 truck with a 350... I took off the valve covers to change the gaskets and there is alot of sludge built up inside of covers and on the heads. I have cleaned them up some but am worried about the oil screen. I was told i could drain the oil and add about a gallon of diesel fuel and let it sit,and drain it after about 2-3 hours , but aint sure. any good ideas???? thanks

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Old 05-29-2012, 06:36 PM
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Diesel fuel and rislone and all the other things are snake oil.
There is not substitute for good ol maintenance, like changing oil frequently.
I see you just got it and it was that way, not your fault , I know.
Best thing to do at this point would be to pull the motor out, tear it down , clean out the sludge and reseal the engine.Install with fresh oil and filter.
Or, dont disturb any of the sludge and just change oil to a quality detergent oil, and change it a few times ,like say at 1000 miles each time.
Stirring that pot is sure to bring trouble,if you scrape at it here and there , you will break crap loose and some will go down to the pan and ultimately end up in the screen of the pickup, plugging it and croaking your motor.
Just had a sludge motor come back after a timing chain replacement. Chick drove it 3000 m iles on the oil change we put in, didnt listen to us about changing it.All the crud was in the oil and the oil was cleaning the engine. But she didnt change it in 1000 miles like we told her to. It looked like mollasses when I drained it, and the pump screen was plugged.
Pretty costly lesson, sad thing is , the girl just did not seem to get it.
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Old 05-29-2012, 07:25 PM
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Quote:
Originally Posted by robbie43
just bought a 1988 chevy 1500 truck with a 350... I took off the valve covers to change the gaskets and there is alot of sludge built up inside of covers and on the heads. I have cleaned them up some but am worried about the oil screen. I was told i could drain the oil and add about a gallon of diesel fuel and let it sit,and drain it after about 2-3 hours , but aint sure. any good ideas???? thanks
Heed LA's advice. Sure as you go messing w/diesel fuel, ATF, or Siloo engine flush, etc, you'll end up w/a smoking mess- if the shellac that's built up, like on the valve stems, is removed, the hard-as-a-rock oil seals (unable to conform to the now smaller OD stems) will be free to pass motor oil straight into the combustion chambers.

Hold off until a proper dis- and re-assembly can be done.
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Old 05-29-2012, 09:27 PM
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Switch to a good oil like valvoline conventional (best oil for the money) and add a quart of marvel mystery oil every oil change. I bet within 4 oil changes 90% of the sludge will be gone. Mobil 1 is also great for this but costlier. Also use a good filter and be sure to change every 3,000 miles.
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Old 05-30-2012, 07:09 AM
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Quote:
Originally Posted by ap72
Switch to a good oil like valvoline conventional (best oil for the money) and add a quart of marvel mystery oil every oil change. I bet within 4 oil changes 90% of the sludge will be gone. Mobil 1 is also great for this but costlier. Also use a good filter and be sure to change every 3,000 miles.
Thanks guys for the feed back, im just going to clean up the covers and put back on and do as ya'll said thankyou
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