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Old 03-09-2013, 11:11 AM   #16
Caperodder
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Default Re: 345 Rebuild

Ok. The piston is measuring .0465 and .0470 deep into the #1 and #8 cylinders. This engine has never been decked, as I can still see the "a" stampings on the surface. Still have to give the piston tops a good cleaning and remeasure to be sure. How much thickness gets lost with the new felpro gasket after it is torqued? It's at .045 now, so I'm guessing around .040 compressed?

What would you recommend for surface removal? .040-.042, or go all the way to say, .045?

Thanks!

-brett
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File Type: jpg #1 Cylinder.jpg (62.1 KB, 181 views)
File Type: jpg #8 Cylinder.jpg (51.1 KB, 177 views)
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Old 03-09-2013, 12:55 PM   #17
Mark Pietz
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Default Re: 345 Rebuild

I decked my ic block 0.030", leaving my silvo-lite flat-tops about 0.003-.006" in the hole (not every piston was exactly the same). So my felpro, compressed with 105# on the studs, was 0.039"-0.040", and my quench around 0.044".

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Old 03-09-2013, 01:02 PM   #18
Robert Kenney
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Default Re: 345 Rebuild

You really want to end up at .040-.045 quench. The fp gasket will crush to .042 +/-. Depending on where the others fall down in the hole after the final measuring you'll come up with the correct amount to machine off of the deck.

Can you tell if the pistons are oem?
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Old 03-09-2013, 01:15 PM   #19
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Default Re: 345 Rebuild

Thanks guys,

here is a photo of the piston markings. I'm measuring 3.877 in the bore, so I'm pretty sure we are at standard size.

Sounds like I should clean each piston, remove the rings, put them back into their bores and measure each cylinder and find the tallest piston.

Want to make sure I'm doing everything exactly right. As we all know, we can't put the metal back on.

-brett
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Old 03-10-2013, 08:56 AM   #20
Robert Kenney
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Default Re: 345 Rebuild

I suspect you are close with the .040 in the hole. I would not deck the block untill you either decide to use the old pistons or get new ones and, take measurments using those...
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Old 03-11-2013, 03:10 PM   #21
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Default Re: 345 Rebuild

Since I'm taking everything apart at present, I though I'd start looking at the heads. Can anyone comment on the valve seats regarding lead free conversion? I don't see the typical inserts that I would expect on the intake valve seats if this head were modified.

Thanks.

-brett
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Old 03-11-2013, 05:11 PM   #22
Robert Kenney
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Default Re: 345 Rebuild

You would normally only need to worry about the exhaust seats and you have inserts in that photo. The IH valve is also stelite faced.
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Old 03-11-2013, 06:04 PM   #23
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Default Re: 345 Rebuild

Hello Robert,

from what I can gather, new valve seat inserts do not need to be installed. What is recommended here? Just a lap job, or should these be reground?

Thanks,

-brett
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Old 03-11-2013, 06:32 PM   #24
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Default Re: 345 Rebuild

Sorry I was not clear in my reply. What I wanted to say was that you're set the way it is and won't need anything more to be unleaded fuel safe. Stelite valves and hard seats are good for anything.

Just verify the guides are good and deface the seats and valves. Make sure to top and bottom cut the seats to set the margins and whiths are correct.
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Old 03-12-2013, 11:00 AM   #25
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Default Re: 345 Rebuild

Pulled the valves out last night and noticed the end of the #7 exhaust valve has unusual wear. Almost looks like the hardened part of the valve chipped off. I'll replace this one. Any idea what causes this?

-brett
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Old 03-12-2013, 12:59 PM   #26
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Default Re: 345 Rebuild

Looks like the rockers were not flat and ran on the corner of the valve stem. What do you see on the rockers. That kind of focused loading can fail hardened steel like the laminated end on that valve.
Other than that hammering from exessive lash?
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Old 03-24-2013, 02:01 PM   #27
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Default Re: 345 Rebuild

This is what I found on the rockers. .013" of wear. I take it these must be replaced? Looks like two or three in this condition.

-brett
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Old 03-24-2013, 04:06 PM   #28
Robert Kenney
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Default Re: 345 Rebuild

They can be resurfaced by a rocker arm re builder .......orrrrr replaced.
Either way they must be dealt with.
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Old 03-25-2013, 06:17 AM   #29
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Default Re: 345 Rebuild

Called my machine shop and they have done these before. They even have a jig all ready to go, so each will be resurfaced.

What happens when you don't change your oil on an IH? #3 oiler is completely blocked. No lube going to either shaft. Surprisingly, the shaft shows very little wear.

-brett
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Old 03-25-2013, 10:42 AM   #30
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Default Re: 345 Rebuild

Are you sure that had a feed hole in the head below it? Many times rocker shaft stands other than the oiler get the passage. Depends on the assebler I suppose...
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