Danderson
Full Access Member
- Joined
- Feb 23, 2020
- Posts
- 62
- Reaction score
- 193
- Location
- Chatsworth GA
- First Name
- Doug
- Truck Year
- 1977
- Truck Model
- K10
- Engine Size
- 350
I've got an issue that has me stumped. I have a 1977 K10 that has a 350 Goodwrench crate motor installed by a previous owner so mileage is unknown. It's my daily driver and runs great. It has had a rear main seal weep for a while, but nothing more than a few drops overnight so I've put off changing it. I've been driving it every day for over a year and the oil pressure has consistently been about 20 PSI at idle and 30 PSI at highway speed and it hasn't used oil at all.
Recently I changed the oil and filter. 10w-30 oil and PF 35 oil filter. Immediately after the change I noticed the oil pressure was 30 PSI at idle and 45-50 PSI at highway speed. After sitting overnight there was a small puddle of oil under the truck, not a ton, but enough to concern me. The oil filter was tight and the drain plug was not leaking. It appeared the oil was leaking out of the flywheel shield as it would with a rear main seal problem.
I drove it a few days, probably about 100 miles and the higher than normal pressure and the leaking continued. I checked the oil and it was down about a quart. Since the only thing I had done was the oil change I suspected maybe an issue with the filter. I changed the oil and the oil filter again and the exact same condition continues. Higher than normal pressure and a fairly nasty oil leak out the hole in the bottom of the flywheel shield.
The engine runs great, isn't burning any oil or misbehaving at all. I'll be changing the rear main seal this weekend, but the high oil pressure indication has me worried that something else is going on.
Has anyone experienced anything similar or any advice on what else to look at? Maybe it was just coincidence, but it seems to have been caused by the oil and filter change and that makes absolutely no sense to me.
Recently I changed the oil and filter. 10w-30 oil and PF 35 oil filter. Immediately after the change I noticed the oil pressure was 30 PSI at idle and 45-50 PSI at highway speed. After sitting overnight there was a small puddle of oil under the truck, not a ton, but enough to concern me. The oil filter was tight and the drain plug was not leaking. It appeared the oil was leaking out of the flywheel shield as it would with a rear main seal problem.
I drove it a few days, probably about 100 miles and the higher than normal pressure and the leaking continued. I checked the oil and it was down about a quart. Since the only thing I had done was the oil change I suspected maybe an issue with the filter. I changed the oil and the oil filter again and the exact same condition continues. Higher than normal pressure and a fairly nasty oil leak out the hole in the bottom of the flywheel shield.
The engine runs great, isn't burning any oil or misbehaving at all. I'll be changing the rear main seal this weekend, but the high oil pressure indication has me worried that something else is going on.
Has anyone experienced anything similar or any advice on what else to look at? Maybe it was just coincidence, but it seems to have been caused by the oil and filter change and that makes absolutely no sense to me.