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Ford 9N, 2N & 8N Discussion Forum

wet and dry compression

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9N again

03-15-2007 17:03:14

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Howdy yall, just check my compression and this is what i get, Starting from #1 closeset to the seat DRY(#1 90), (#2 90) , (#3 95), (#4 100) with a little oil (#1 100), (#2 70) , (#3 105), (#4 100)
So how do these numbers look, I dont understand #2 dropping after adding oil, rechecked twice.
This all started after finding water in the oil. Your 2 cents are worth a pot of gold.
Thanks

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Bob Harvey

03-15-2007 18:47:46

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Re: wet and dry compression in reply to 9N again, 03-15-2007 17:03:14

1. How does this engine run ? smooth / rough?
2. Have you had it up to operating temp. recently?
3. Why/How did you decide there was a problem?
4 Front mount , or the other?

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9n again

03-15-2007 20:02:36

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Re: wet and dry compression in reply to Bob Harvey, 03-15-2007 18:47:46

engine runs good, smooth, has water in the oil
thanks

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Dell (WA)

03-15-2007 21:03:06

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Re: wet and dry compression in reply to 9n again, 03-15-2007 20:02:36

9Ner..... ..fer cryin' out loud. REPLACE yer headgasket already $20, (cheap) and by the way NO-PUCKEY the gasket. Why? 'cuz the next time you'll thank me. Use non-metalic.

And INSPECT yer old headgasket for obvious failures.

While you have the head OFF, check for "flatness" with carpenters T-square. Iff'n you don't know how to look for light seeping under the carpenters blade. Have a machine shop show you. Remember you can only "skim" or mill the head ONCE.

Otherwize, yer wet-vs-dry delta-P of about 10psi, tells me yer rings and valves are in pretty good shape..... ..respectfully, Dell

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9n again

03-15-2007 21:22:40

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Re: wet and dry compression in reply to Dell (WA), 03-15-2007 21:03:06

thanks dell

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Bob

03-15-2007 17:29:29

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Re: wet and dry compression in reply to 9N again, 03-15-2007 17:03:14

It would be less confusing if you used conventional cylinder numbering starting with #1 at the front next to the radiator!(smiling)

To me those are pretty good numbers for a 55 year old machine!

Start it up and work it a bit so it gets warmed up then check again.

Almost certainly the "wet" drop in compression on cylinder #2 (#3 to the rest of us) is due to a piece of carbon or crud that got "washed" onto a valve seat and it will MOST likely clear itself and the next test will look better!

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Dunk

03-15-2007 17:45:55

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Bob in reply to Bob, 03-15-2007 17:29:29

Bob...

Or it finishes off the blowing of the head gasket into the oil passage.

(Don't forgit he had antifreeze in the oil.)

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9n again

03-15-2007 18:34:03

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Re: Bob in reply to Dunk, 03-15-2007 17:45:55

Dunk
do you think I shold replace the head gasket

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Dunk

03-15-2007 17:48:41

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Re: Bob in reply to Dunk, 03-15-2007 17:45:55

Errrr, maybe that was supposed to be water passage into the cylinder.

(Dang, I may just be off my rocker)

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Bob

03-15-2007 17:55:05

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Re: Bob in reply to Dunk, 03-15-2007 17:48:41

Dunk

I wish we were neighbors and could share shop "BS" sessions!

Heaven only knows what problems would get "solved"!

Speaking of blown gaskets my darned big shop air compressor blew a gasket today. Thought it was the head gasket but it turned out to be where the outlet fitting/finned air coller mates withe the head.

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Hobo,NC

03-15-2007 18:46:22

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Re: Bob in reply to Bob, 03-15-2007 17:55:05

I had a S-10 with a 2.2 that I had rebuild, 2 years later it broke a valve spring. It turned out to be a hard skip to find. So I pop the valve cover take the spark plug out and throw 175 PSI air to it off the shop air line and while I am remove'n the spring Pop the head gasket, you kin bet yer sweet arse i regulate the air now when i do this type of job. You and me know that 100 psi would hold the valve up.

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Dunk

03-15-2007 19:09:58

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Re: Bob in reply to Hobo,NC, 03-15-2007 18:46:22

I pulled something similar on an S-10 changing the water pump, and blowing the holes out with air.

Ended up having to pull the timing cover, and replace that gasket I blew out.

Dang Chevy V-8 I grew up with sure didn't have that problem.

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Dunk

03-15-2007 18:15:59

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Re: Bob in reply to Bob, 03-15-2007 17:55:05

I heard that Bob. (I bet that would be cool!!)

Aggrivating when you are gonna git something done, and your air compressor is the main player, and then it is the first thang you have to work on...

BTDT

Bless yer heart.

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A. Bohemian

03-15-2007 17:41:41

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Re: wet and dry compression in reply to Bob, 03-15-2007 17:29:29

Thanks, Bob. I was curious myself.

I would only add, be careful not to over-torque the sparkplugs while the motor is warm.

In fact I only re-torque plugs on cool motors; but I"m superstitious about some things.

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