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Do you think I might need new valve guides? |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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Posted: Oct/16/2020 at 5:14pm |
1958? L-head. I can't believe this engine ran long enough to wear away this much metal. OK the exhaust would just fill the crankcase (understatement) but how did it have any intake vacuum at all?! Unbelievable. Three of them cracked off a tip where the metal *wore through*. The thing is, the bores were standard ("0 under") the cyls 3, 4 thousandths of taper (could be more, was a quick check of rusty cylinders). Bearings were shot, looks like water in the oil (grey goo). The engine arrived disassembled. At first I thought the valves were the wrong ones; too loose in the guides, and a 195.6 OHV valve fit in more than one of the guides!! The cam profile is so sharp you can almost cut your finger. Oh boy I wonder how sensible a project this is. They're not very good motors! lol. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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wittsend
AMC Nut Joined: Apr/15/2020 Location: California Status: Offline Points: 413 |
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I assume one set idles speed by how tight the valve (side) cover is screwed down? And in Project Farm style, "Can a car idle on oil fumes..., let's find out."
Just invert the guide to wear on the other side, reinstall and wind string around the valve stem for control.
Edited by wittsend - Oct/16/2020 at 10:19pm |
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'63 American Hardtop
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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I like your thinking! Idling on your own oil fumes could re-fill the crankcase too! With new valve guides costly nearly three dollars fifty, I may consider your excellent scientifical suggestion. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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gtoman_us
Moderator Group Joined: Jul/10/2007 Location: E. Nebraska Status: Offline Points: 3859 |
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Just a little bit of JB Weld will fix’m like new.
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Moderator - Emeritus
Used to collect trophies, now I collect gas receipts and put on miles 1964 Rambler Ambassador Cross Country Wagon 1965 GTO 1931 Model A original survivor "Flat Roofs are Cool" |
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3529 |
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That graphite packing rope like used on old spigots
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CR CRUISER
AMC Apprentice Joined: Aug/13/2007 Location: Canada Status: Offline Points: 166 |
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A can of STP for the win.
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PAGAENT
AMC Apprentice Joined: Jan/16/2020 Location: 93446 Status: Offline Points: 140 |
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Is it possible that the valves have 11/32 stems in 3/8 guides? Dr. Faucci probably couldn't explain how the guides could wear like in the pictures.
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Pat Gary
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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I'm gonna email the guy who gave me the engine. It is a little too much. They're the skinny L-head valves. I have a couple OHV valves. They are identical except for the stem diameter, all are by the book.
It is a mystery how such I thing could run. Could idle, more specifically. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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wittsend
AMC Nut Joined: Apr/15/2020 Location: California Status: Offline Points: 413 |
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Maybe the motor had a turbo and the guides are a form of boost control. Sort of an individualized wastegate.
Seriously though, a flat head would not get the guide side loads that a OHV engine gets from the fulcruming rocker. So it makes the egg shaped guide even more worn that one should think it would have. My daily drive Mazda has the bucket lifters (should be called plungers being they move downward) and I'd think they go a long way to, one, reducing valve side loads, and two, shielding the guide from excessive oil. Likely that and modern oils allow cars to go 200,000-300,000 miles when given proper care.
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'63 American Hardtop
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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yeah, there is actually a lifter pushing up on the valve in the usual way, from the bottom up. There must be more to it than just wear. I just got back from a weekend event and haven't written Andy yet.
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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