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Old 10-09-2018, 06:24 PM   #1
drdolil99
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Default Low compression cylinder 1

This all started a couple months ago when I purchased a 2006 Impreza 2.5i.

I knew what I was getting myself into because it had a spun bearing so I ended up buying a block from united Arab emirates. I found them on eBay and saw that they had excellent reviews.

About a half hour after putting the block and I realized I should have replace the tensioner two, the tensioner failed and ended up bending Nine valves, one Intake and eight exhaust valves.

I remove the engine, took to heads to the machine shop and had them rebuild. They replaced all valves and charge me about $450.
A couple of days later my son decided he was going to take a ride to work and all of the sudden there was no compression in cylinder one. He couldn’t even get the car home.

I did a compression test and realized that cylinder one was only getting about 30 psi. I did a leak down test and couldn’t hear air coming from anywhere. I even spun the crankshaft and heard the valves opening and closing, but no leakage. The only place I feel any type of leaking is from the spark plug hole it’s self. I tested the leak down tester on other cylinders and it works with no leak. Is it possible that something happened to the spark plug threads.
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Last edited by drdolil99; 10-10-2018 at 09:45 AM. Reason: Sorry for the previous grammatical errors, I was using speech to text and my NJ accent caused it.
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Old 10-12-2018, 09:04 PM   #2
Elbert Bass
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Need the rest of the story there -
What was the cylinder leakage value?
You screwed the compression and cylinder leakage tester into the spark plug hole - was it stripped? Did the tool tighten up in the hole? Does the spark plug tighten up in the hole?
When do you feel this leaking from the spark plug hole - during the leakdown test - when turning the engine over with the plug out?
Did you adjust the valves after the machine shop work and installing on the block?

You should have been able to drive home on 3 cylinders - have you checked the other cylinders? Particularly #3?
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Old 10-12-2018, 11:03 PM   #3
Blktrax
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Did you check the coolant overflow bottle for air bubbles to make sure the head-gasket wasnt/isnt leaking?
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Old 10-15-2018, 10:44 AM   #4
Iw27
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Did you confirm after getting the work done that the engine had good compression?
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Old 10-18-2018, 12:07 PM   #5
drdolil99
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You can see my replies to the questions below.

Quote:
Originally Posted by Elbert Bass View Post
Need the rest of the story there -

What was the cylinder leakage value? Canít remember at this point

You screwed the compression and cylinder leakage tester into the spark plug hole - was it stripped? The spark plug hole doesnít seem stripped at all, I can tighten a plug in there like I normally do.

Did the tool tighten up in the hole? Yes

Does the spark plug tighten up in the hole? Yes

When do you feel this leaking from the spark plug hole - during the leakdown test - when turning the engine over with the plug out?

I feel it during the leak down test

Did you adjust the valves after the machine shop work and installing on the block? The machine shop adjusted the valves for me. It was part of the rebuild.



You should have been able to drive home on 3 cylinders - have you checked the other cylinders? Particularly #3? Compression on all the other cylinders are the same. Around 135 with my tester. This cylinder gives me 30psi.
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Old 10-18-2018, 12:08 PM   #6
drdolil99
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Quote:
Originally Posted by Iw27 View Post
Did you confirm after getting the work done that the engine had good compression?


The engine had 135 in all cylinders until this happened. Only 2 days after the rebuild.
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Old 10-18-2018, 12:54 PM   #7
Charlie-III
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To start, 135PSI on a Subaru NA engine is low, decent for a turbo engine, but low for NA.
We have to assume the battery was charged, throttle open, etc.

If low compression, did you try a shot of say....30wt oil in the cylinder and recheck the compression?
If it comes up, rings are an issue since the oil will help the rings seal for a bit.

If leakdown is low, then you should hear air moving through.....
Exhaust (exhaust valve/valves)
Intake (intake valve/valves)
Oil filler cap (rings)

In your case, maybe crud in the spark plug hole for cylinder 3 keeps it from sealing. Can you get a light in the plug hole and look for cracks?
I have a cheap ($15?) lipstick camera I plug into a USB port on a laptop. It allows me to look at some things.

Frankly, 2 dead cylinders on a 4 cylinder engine should get you home, slowly, but home.

Where in north NJ are you?
I am just west of rt287, 3 miles from the NY border.
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Old 10-18-2018, 07:11 PM   #8
drdolil99
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Red

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Im in woodland park, NJ.

Quote:
Originally Posted by Charlie-III View Post
To start, 135PSI on a Subaru NA engine is low, decent for a turbo engine, but low for NA.
We have to assume the battery was charged, throttle open, etc.

If low compression, did you try a shot of say....30wt oil in the cylinder and recheck the compression?
If it comes up, rings are an issue since the oil will help the rings seal for a bit.

If leakdown is low, then you should hear air moving through.....
Exhaust (exhaust valve/valves)
Intake (intake valve/valves)
Oil filler cap (rings)

In your case, maybe crud in the spark plug hole for cylinder 3 keeps it from sealing. Can you get a light in the plug hole and look for cracks?
I have a cheap ($15?) lipstick camera I plug into a USB port on a laptop. It allows me to look at some things.

Frankly, 2 dead cylinders on a 4 cylinder engine should get you home, slowly, but home.

Where in north NJ are you?
I am just west of rt287, 3 miles from the NY border.
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