90 454 TBI P30 non-ferrous brass particulate in oil
July 24th, 2017, 1:09 PM
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90 454 TBI P30 non-ferrous brass particulate in oil
Hello All,
Mechanic here from AZ requesting feedback from members with good knowledge of engine internals construction.
I have discussed this issue with other mechanic and am also posting here requesting assistance on forming a correct diagnosis.
Vehicle is a 1990 Bounder motorhome on a Chevy P30 chassis. Low miles at 50K. Always been babied with LOF's every 3K. Low reving, very few warm up cycles at it is usually driven distances.
Last oil change I spotted a bright shimmer in the oil as I was pouring it into the waste oil tank.
cut open the filter to look for debris, but found nothing at all. But could see brass/bronze non ferrous micro particulate in the oil.
Finished LOF with new filter and Mobil1 10W-40 as per usual (live in AZ gets hot here)
Drove the unit for approx 200miles on a trip and drained the oil into an oil catch container.
I could see brass/bronze particulate in the pan -not much but it was there - but then, I had only driven 200 miles.
Strained the oil with a shop cone type disposable straining filter - nothing in the filter.
The brass/bronze particulate is so fine it is not being caught in the strainer.
Which brings me to the question I need assistance with....
What wearing components in a 1990 454 were manufactured from brass/bronze and could be responsible for what I'm finding in the oil?
Assistance would be greatly appreciated. I'm pretty certain I've found the problem early enough to remedy, just need assistance to diagnose correctly prior to removal of engine from the motorhome (Not looking for ward to that😵
and possible stripdown.
Thank you in advance, if there is more information you require that I have neglected to include, ask away!
CelticJack.
Mechanic here from AZ requesting feedback from members with good knowledge of engine internals construction.
I have discussed this issue with other mechanic and am also posting here requesting assistance on forming a correct diagnosis.
Vehicle is a 1990 Bounder motorhome on a Chevy P30 chassis. Low miles at 50K. Always been babied with LOF's every 3K. Low reving, very few warm up cycles at it is usually driven distances.
Last oil change I spotted a bright shimmer in the oil as I was pouring it into the waste oil tank.
cut open the filter to look for debris, but found nothing at all. But could see brass/bronze non ferrous micro particulate in the oil.
Finished LOF with new filter and Mobil1 10W-40 as per usual (live in AZ gets hot here)
Drove the unit for approx 200miles on a trip and drained the oil into an oil catch container.
I could see brass/bronze particulate in the pan -not much but it was there - but then, I had only driven 200 miles.
Strained the oil with a shop cone type disposable straining filter - nothing in the filter.
The brass/bronze particulate is so fine it is not being caught in the strainer.
Which brings me to the question I need assistance with....
What wearing components in a 1990 454 were manufactured from brass/bronze and could be responsible for what I'm finding in the oil?
Assistance would be greatly appreciated. I'm pretty certain I've found the problem early enough to remedy, just need assistance to diagnose correctly prior to removal of engine from the motorhome (Not looking for ward to that😵
and possible stripdown.Thank you in advance, if there is more information you require that I have neglected to include, ask away!
CelticJack.
July 24th, 2017, 2:05 PM
#3
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That would be an easy fix!
At the moment it's holding 40PSI of oil pressure at idle when hot and the outside ambient is +100F
Thanks for the reply, I've not previously had to strip a 454 big block and am unfamiliar with component construction.
At the moment it's holding 40PSI of oil pressure at idle when hot and the outside ambient is +100F
Thanks for the reply, I've not previously had to strip a 454 big block and am unfamiliar with component construction.