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Old 01-03-2020, 12:52 PM   #1
jbnnthorn
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Default 1.9L SOHC compression/ pressure from blow-by

I have a 2000 Saturn SL1 1.9L SOHC I purchased with a cracked head. I had the head redone and reinstalled it. After driving it about 1,000 miles the valve cover and timing cover started to leak. I had replaced the PCV valve. I am thinking the seals blew due to blow-by. I would say the engine used about a quart of oil over the 1,000 miles. The engine has about 145,000 miles. If I pull the PCV valve it has a light gray coating I can wipe off. I wouldn't call it oil. I also lightly blew air through the bypass in the valve cover to be sure it wasn't blocked.

If I do a COLD compression test now I get:
#1 160
#2 155
#3 150
#4 160

WARM I get
#1 130 - 160 if I add oil
#2 150
#3 162
#4 160

Is it possible the ring is stuck on #1 or just worn out?

My daughter uses this at college about 2 hours away and I can't always check the oil. We recently used and drove it locally a few times and it was down like a third of a quart. I resealed the valve cover prior to that but not the timing cover. It has a few drops under the car when you park it now after driving it.

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Old 01-03-2020, 01:06 PM   #2
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Default Re: 1.9L SOHC compression/ pressure from blow-by

Good compression should be in the 175-205 range for an SOHC S Series and all should be within 10 of each other. Your engine appears to be worn and its probable that all the rings or valves are leaking.

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Old 01-03-2020, 02:22 PM   #3
jbnnthorn
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Default Re: 1.9L SOHC compression/ pressure from blow-by

Agree, The lower end is worn as I mentioned the head was redone. It is more important to have them all 4 close together than it is any one number. My compression gauge is 30 years old so it could be off a bit.

I was wondering about something like this thread on piston soaking when I was asking (233961). If I had all 4 at 155 to 160 I think it would make a difference. It won't let me copy the URL.

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Old 01-04-2020, 03:55 PM   #4
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Default Re: 1.9L SOHC compression/ pressure from blow-by

1-Lecture your daughter the Saturn hymnal often used in the S-series owner community; check the oil at every gas fill up or at least every other fill up. If she can't afford gas then at least check the oil to be sure it doesn't go below the dipstick. She'll need to learn the minimum oil check necessity in her college life otherwise she'll learn the hard way of car neglect with a costly outcome, losing a car.

2-Being far away and unable to work on a car with 140k miles and low compression may qualify for choosing one of several oil treatments that may help loosen any crud in piston rings to help raise compression. Many threads cover this area with many suggestions. Some expensive, some moderately priced, the rest low cost. If not a winter car, using high viscosity oil may be the lowest cost temporary solution to raising compression.

3-You can post URLs as a newbie by not copying and pasting the link but typing the address in plain text and placing spaces to separate the address so it won't be recognized as a link new members try when spamming. Once you surpass 15 posts, you'll be able to copy and paste links.

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Old 01-12-2020, 01:20 PM   #5
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Default Re: 1.9L SOHC compression/ pressure from blow-by

Leaky timing cover could cause a lot (relatively) of oil loss while driving with minimal drops showing on the floor when parked.

I didn't get the mating surfaces clean enough first time I did it, used a lot of oil when driving but not seeing a lot on the ground. After a reseal, cleaning with pure acetone, oil usage dropped dramatically.

(bumping p2 threads to push spam threads down)

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