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1960 rambler classic 196 smokes on start up

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farna View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 6:56am
I'm not sure the term "broaching" is correct, but there is a process they used to use that raised the surface area by making small indentations or cuts in the surface of the inside of the guide. The tool bit into the guide surface when turned, raising small metal dimples, then retracted when turned the opposite way. Then it was reamed to size. So you end up with no more than 50% of surface area than the original guide. Stands to reason it won't last but half as long, usually less than that, but back in the day it would last as long as the rest of the engine. Today it's just about the same to replace the guides, and I don't think anyone does that any more.

If you send the head to a shop to have it rebuilt (new guides and seas cut... and get those positive seals installed on top of hte guides!) have it checked for cracks and trueness (flatness) FIRST. Some shops will suggest that for an old head, some won't. Not much point in putting a lot of money in a badly cracked head. It will run just fine with a few fine cracks, at least until it's run hot again, but it would be time to start looking for a good head or contemplating a swap to a newer motor. The early 199/232 will bolt in without too much work, unless you have a 58-63 American. Engine bay just too short in those.
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amc67rogue Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 10:34am
Knerling the guides . If the guides are really bad have them replaced.

Edited by amc67rogue - Apr/21/2017 at 10:37am
Keith Coggins 67Rogue X code
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Post Options Post Options   Thanks (0) Thanks(0)   Quote vinny Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 11:35am
Yeah I remember knurling from high school where we used to put a pattern on thumbscrews or similar things in the lathe.

I agree that the head is probably ready for rework. It would be a relatively cheap fix and give the engine a few more years of good service. Having valve guides replaced would also eliminate the possibility of old ones disintegrating and clogging up the screen. 

Another question; how big (wide) are new valve guides and are they already cut for the new seals? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andyleonard Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 5:33pm
No, the guides are removable at home with a valve guide drift and a hammer. New 196 OHV guides are $2 each from Egge and go in with the same tool you used to get the old ones out. Put the new guides in the freezer overnight to shrink them a little. Easy job. Then relap the valves to make sure everything's centered. Cutting the new (or old) guides for the little teflon seals is still a good idea. The original style rubber seals aren't worth much.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 6:12pm
That's it!! Knurling!! But on the inside it's tougher to do than on the outside...
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amc67rogue Quote  Post ReplyReply Direct Link To This Post Posted: Apr/21/2017 at 8:38pm
Well if there removable with a drift punch as andyleonard says why bother with Knurling.
Keith Coggins 67Rogue X code
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