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Rocker arm oil , other random questions
#1303252 Sat Mar 16 2019 04:28 AM
Joined: Nov 2018
Posts: 13
J
Joe W Offline OP
New Guy
#1 cylinder rocker arm isnt oiling itself, I was wondering what the easiest way to tackle the issue. I inserted a stiff wire in the weep hole and it didn't do anything to fix the issue. The other rocker arms are fine.

video of rocker arm

dry rocker arm

Based on the serial # on the engine, F56Z, it is an automobile engine w Hydraulic lifters? is there an easy way to verify the lifters type?

Edit: it's a 235 in a '51 3100. Engine was rebuilt years ago, bu the truck sat for 2 yrs. Engine build date code K 4 55

Last edited by Joe W; Sat Mar 16 2019 04:35 AM.
Re: Rocker arm oil , other random questions
Joe W #1303269 Sat Mar 16 2019 12:00 PM
Joined: Sep 2001
Posts: 29,536
ace skiver
Have you ever taken the rocker arm assembly apart?

If you did, did you completely clean the inside of both bars/tubes, and check all holes in the arms and in the tubes?


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Rocker arm oil , other random questions
Joe W #1303279 Sat Mar 16 2019 01:53 PM
Joined: Nov 2018
Posts: 13
J
Joe W Offline OP
New Guy
No I haven't. I forgot to mention that I am a new at this and was hoping to avoid disassembly. But if that's the only way to get it done, so be it. Thanks.


Last edited by Joe W; Sat Mar 16 2019 04:13 PM.
Re: Rocker arm oil , other random questions
Joe W #1303291 Sat Mar 16 2019 02:47 PM
Joined: Jan 2002
Posts: 2,033
C
Shop Shark
You could try doing a disassembly of the rocker arm assembly near #1 but I would just rip into the whole assembly.


Craig's '50 Chevy 3100 5 window
My truck
If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
Re: Rocker arm oil , other random questions
Joe W #1303292 Sat Mar 16 2019 02:53 PM
Joined: Jan 2013
Posts: 1,603
S
Shop Shark
Since it is a distal rocker arm that isnt oiling,I would first remove the side cover and visually inspect (including removing for cleaning, then replace) the oil hard line for kinks and restriction first.

Then, If you are very careful to not mix up the rocker arms/pushrods on disassembly, and do not tamper with the adjustment or cinch nuts, you might be able to get by without a valve adjustment and completely disassemble the two sides of the rocker shaft for inspection and cleaning.

Last edited by sstock; Sat Mar 16 2019 03:01 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Rocker arm oil , other random questions
Joe W #1303340 Sat Mar 16 2019 09:43 PM
Joined: Mar 2010
Posts: 8,967
5
Master Gabster
Before you tear anything apart, run the engine at idle until it reaches operating temperature (180 degrees or so), look for oil weeping out of the oil hole in the #1 rocker. That #1 is the last to receive oil and sometimes it takes a while to have enough pressure at idle to make it out the hole.
Prior to it weeping out of the hole, you should see some oil leaking out of the bottom of the rocker along the sides. This indicates that the rocker is getting lubed at the bottom (which is where all of the friction is going on) even though it isn't coming out of the hole yet.
You could also turn the idle up on the carburetor to increase your RPM, and therefor, oil pressure to see if the oil comes out of the rocker hole sooner.
Carl

Re: Rocker arm oil , other random questions
52Carl #1303345 Sat Mar 16 2019 09:58 PM
Joined: Nov 2018
Posts: 13
J
Joe W Offline OP
New Guy
52Carl, I idled it for 30 minutes before checking. #1 rocker weeps oil from the top, and from the bottom. Just #2 rocker doesn't weep from the top, yet does leak from the bottom, although slower than the rest. I'll turn up the idle to build more pressure to see if that changes things.


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