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Seeking Comments on View of 1951 288 Head-off Valves and Piston Tops
#1
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kunzea
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Please provide constructive comments on state of valves and pistons. Head gasket and studs. Photos of 1 and 2 are in reverse order

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Posted on: 5/25 17:20
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Re: Seeking Comments on View of 1951 288 Head-off Valves and Piston Tops
#2
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TxGoat
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Just looking, the water jacket looks exceptionally clean. The corroded studs and uneven gasket discoloration may indicate some slight gasket seepage, which is not unusual. The carbon deposits look normal. Beyond that, precision measurements would be needed. The valves look pretty good, but slight leakage may or may not be occurring. The # 7 cylinder' exhaust valve may have been running a little hot due to lack of clearance at the tappet or poor seating. I doubt that that engine is cracked, from the look of it, but cracks can be hard to see.

Posted on: 5/25 19:16
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Re: Seeking Comments on View of 1951 288 Head-off Valves and Piston Tops
#3
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53 Cavalier
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Pistons and valves "look" okay, but don't know without checking. It does seem like the gasket wasn't sealing as well as it should have been. Here's a picture of my 327 from my 53 Cavalier when I dug into it last spring.

Click to see original Image in a new window


I went into my engine because I had a tapping sound, which turned out to be a very worn valve guide. I'm guessing there's a reason you decided to pull the head off? Did you have a noise? Low compression? Nothing better to do so decided to pull your engine apart? LOL

Do you know the history of the engine? Now that you're that far in, what's your plan?

Posted on: 5/26 0:45
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Re: Seeking Comments on View of 1951 288 Head-off Valves and Piston Tops
#4
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kunzea
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I went into the head because of several things.

The engine had a tapping sound that was inconsistent. The idle was rougher than it should be. It would curb idle just under 400 but just didn't sound right.

If I started it and operated it like I thought would be normal it had a really loud tap. With moderate acceleration the tap was pretty loud. The vacuum was about 17 with about a +/- just over a pound swing. If I took the compression right after an extended ride one of the cylinders was about 60 lbs. As it cooled off it came up to the others. If I cranked it and left it alone to warm up then drove with minimal acceleration it wouldn't tap too badly. On the other hand, once it started tapping it would persist pretty much for the whole trip.

I decided I had put it off long enough.

Here is a photo that represents all of the exhaust valves. The intake valves were not nearly as bad. Most of the valves were hard to pull out. I took a drill-bit-like wire brush and ran it through all of the valve guides. Most of them emitted carbon dust when running the brush. I have ordered a 11/32" reamer. In the interim I took a 11/32" drill bit and tested the clearance in some of the guides. It passed out the bottom on some but the others were obstructed.

BTW, I used a hand lapping tool on one of these cleaned exhaust valves then installed it with the spring and keepers. I filled the cavity around the valve with 30W oil. After about an hour and a half the oil was still there. The next morning it had drained. I have ordered a drill operated valve lapping tool to try to do a more thorough job.

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Posted on: 5/28 22:27
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Re: Seeking Comments on View of 1951 288 Head-off Valves and Piston Tops
#5
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53 Cavalier
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That sounds exactly like my engine last year. I ended up replacing most valves, valve guides (except the back 3), coated the pistons, replaced rings, cleaned and tested lifters. All good now!

Posted on: 5/29 2:39
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