Cold Compression test
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Joined: Mar 2009
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From: Mesa, AZ USA
Cold Compression test
This engine is known for the oil rings getting stuck with carbon and then leading to oil burning. Something about not enough oil drain holes in the piston groove. Quite a few people have suffered this, but not our car...yet.
At 83,000 miles, we may be starting to see the first signs of oil burning with the oil level on the dipstick. I always fill the sumps to the top line / dot on the dip stick, so after 3000 miles, looks like the engine is about 1 pint down.
I want to see if the Valvoline Clean & Protect can clean the deposits away, The oil geek & valvoline claim wonders, so I will be changing the oil & filter today.
I will also be doing a cold compression test to see if there is any degradation there. During the test I forgot to open the throttle, but the pressure got there anyway at about 6 compressions. Would have been faster if I had remembered.
In the video you will note that I don't use a spark plug socket. I have experienced those little rubber plug holders come out of the socket and get stuck on the ceramic part of the plug. Then it's really hard to get them out. I show the use of a 16mm deep well socket & a length of 5/16" (8mm) fuel tube to remove & replace the plugs. Solved that problem.
There was a lot of carbon on the plug threads, so I used some WD40 to make it easier.
I will monitor the oil level over the next year, to see if the loss is reduced or not. Results around Xmas next year??? It will take us that long to put 3k miles in the car.
At 83,000 miles, we may be starting to see the first signs of oil burning with the oil level on the dipstick. I always fill the sumps to the top line / dot on the dip stick, so after 3000 miles, looks like the engine is about 1 pint down.
I want to see if the Valvoline Clean & Protect can clean the deposits away, The oil geek & valvoline claim wonders, so I will be changing the oil & filter today.
I will also be doing a cold compression test to see if there is any degradation there. During the test I forgot to open the throttle, but the pressure got there anyway at about 6 compressions. Would have been faster if I had remembered.
In the video you will note that I don't use a spark plug socket. I have experienced those little rubber plug holders come out of the socket and get stuck on the ceramic part of the plug. Then it's really hard to get them out. I show the use of a 16mm deep well socket & a length of 5/16" (8mm) fuel tube to remove & replace the plugs. Solved that problem.
There was a lot of carbon on the plug threads, so I used some WD40 to make it easier.
I will monitor the oil level over the next year, to see if the loss is reduced or not. Results around Xmas next year??? It will take us that long to put 3k miles in the car.
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bkcoburn
Scion tC 1G Drivetrain & Power
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Sep 4, 2021 05:33 PM