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By idaho211 - 2 Months Ago
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I have a rebuilt 312 with 1500 miles on it. Noticing right side rockers near firewall more noisy. I have not pulled the valve cover to check for oiling issues. Lash was reset after 100 miles from being rebuilt. Engine builder thinks he needs to reset the lash again. Is this normal or is there another problem why I am getting rocker noise?
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By 55blacktie - 2 Months Ago
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Yes, it's normal to check, adjust lash after break-in. Why didn't you pull the valve cover?
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By idaho211 - 2 Months Ago
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Had some life things get in the way and started up after 5 months.
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By Ted - 2 Months Ago
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Some tappet noise is normal for solid lifter engines. Only by removing the valve covers and doing a preliminary visual and then a valve lash check will you get an idea of what’s wrong if anything. Potential things that can be taking place to make excessive noise are:
- Incorrect initial valve clearance adjustment
- Rocker arm adjuster(s) simply backing off
- Rocker arm stand bolts are loose
- Incorrect pushrods with a smaller than stock ‘cup’ that are trying to ‘wear’ in.
- Lack of oil causing premature wear at the pushrods, rockers, and rocker shafts.
- Cam lobes or tappet faces going away
Engines that sit for extended periods of time are prone to sticking valves due to old fuel. It’s not unusual for sticking valves to allow the pushrods to jump out of place. Fuel that is ½ year old or older is going to be highly suspect and especially if the vehicle is being stored in a non-climate controlled area.
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By 55blacktie - 2 Months Ago
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If you didn't pull the valve cover, I assume you didn't pull the distributor to rotate the oil pump to get the oil flowing. After sitting for 5 months, how long did you have to crank the engine before it started? Do you have an oil-pressure gauge or just a light?
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By idaho211 - 2 Months Ago
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Ted, thanks for the info. I will get some fresh fuel in this weekend and check with covers off.
It started after 10 seconds. Just have idiot oil pressure light.
I use non ethanol fuel. Will it degrade slower than ethanol fuel? Just curious.
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By idaho211 - 2 Months Ago
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Thank you also 55blacktie
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By KULTULZ - 2 Months Ago
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"Just have idiot oil pressure light."
You need to verify oil pressure.
"I use non ethanol fuel. Will it degrade slower than ethanol fuel? Just curious."
It will not degrade as quickly, but will overtime. If it smells like varnish ...
Today's gasoline (even E0) is not the same product as was available in the fifties and sixties.
Were the rocker assemblies rebuilt?
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By idaho211 - 2 Months Ago
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Yes rocker assemblies were rebuilt.
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By KULTULZ - 2 Months Ago
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The rebuild depends on the quality of parts, machining and assembly -
http://forums.y-blocksforever.com/Topic167745.aspx
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By idaho211 - 2 Months Ago
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Rocker arms unlimited. Did run into a problem initially. The adjuster screws were defective. Kept backing off so changed to NOS jam nuts which did fix the problem.
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By KULTULZ - 2 Months Ago
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JUST FYI
O/S ADJUSTERS are available. I would prefer the locking nut style on a HP engine myself personally.
http://yblockguy.com/techtips/rocker_arm_assy.htm
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By BamaBob - 2 Months Ago
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Kultulz, Where are new rocker arm adjusters available from? I have been looking for new ones without any success. Either style would be OK, however I would prefer the lock nut style if I could get them. Thanks for any information!
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By 55blacktie - 2 Months Ago
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John Mummert, ford-y-block.com. He doesn't have online ordering; you'll have to call. The best time to call is between 3:45 and 5, PST.
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By DANIEL TINDER - 2 Months Ago
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I have friction screws AND locknuts (belt & suspenders). Also, the hex screws are then easier to adjust more precisely when using a P&G gapper tool (unless you have 3 hands 😁).
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By KULTULZ - 2 Months Ago
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See if this link works - https://www.youtube.com/watch?v=Q7ZjObWyRJU
It shows a correct rebuild.
Also - https://www.youtube.com/watch?v=mRaiMciNbDA
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By KULTULZ - 2 Months Ago
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THIS - https://www.youtube.com/watch?v=Pst0mEdD018&themeRefresh=1
... will help explain the system.
https://www.youtube.com/@mummertsspecialvinterests2721/playlists
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By DANIEL TINDER - 2 Months Ago
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By KULTULZ - 2 Months Ago
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Did anyone find out if JOHN MUMMERT offers the O/S adj. screws?
C2AZ 6549-A - .0023 O/S
Several years ago, FORD TRACTOR was offering them.
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