Labor Day Putting down your wrenches or time for
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| | | | Joined: Oct 2017 Posts: 214 'Bolter | | 'Bolter Joined: Oct 2017 Posts: 214 | Well I decided to check the valve lash today on a cold soaked engine and expecting to find lots of clearance I found mostly the opposite. Intake varies from 2 to 12 thou and exhaust 7 to 18. Don't know the history of the truck really. Just rebuilt the carb because it wouldn't start or accelerate well and found it was recently gone through and not done correctly. Are the valve seats getting worn, or did someone possibly not know what they were doing? Thanks in advance.
1953 Canadian GMC 9314 w/ (factory) Chevy 235
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
What make, size, year engine?
| | | | | Joined: Oct 2017 Posts: 214 'Bolter | | 'Bolter Joined: Oct 2017 Posts: 214 | The one in the sig, 1953 GMC 9314. Being Canadian, supposed to be the 235 that the US got in 54? 2 nuts on the cover, but has 60 PSI gauge? I'm still figuring this old iron stuff out. I followed the procedure on deves tech net. Could the rocker face be a bit beat out making it seem tighter on the feeler gauge? Engine is really quiet except what sounded like 1 or 2 valves rattling a bit. Thanks!
Last edited by Lindsey; 10/29/2017 11:36 PM.
1953 Canadian GMC 9314 w/ (factory) Chevy 235
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Lindsey,
Yes, grooves worn into the rocker-arm face cause bad readings/settings.
I carefully grind-flat and polish the mating surfaces.
What gap/lash settings did you try to use?
| | | | | Joined: Oct 2017 Posts: 214 'Bolter | | 'Bolter Joined: Oct 2017 Posts: 214 | I haven't adjusted anything yet, I just wanted to see where they're at and figure out a game plan from there. Whoever was in there last used only RTV to seal the cover so that was a treat to remove. Also the acorn nuts had a pile of washers underneath and liberal amounts of RTV as well. Any idea what's supposed to be under the acorn nuts? As weather allows I'll look at the rockers. I've read to add anywhere from 0.002-0.005" extra to a cold engine
1953 Canadian GMC 9314 w/ (factory) Chevy 235
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | I have made thick teflon washers to go under the one steel washer under each acorn nut, studs can be threaded further into head if too long. If over tightened, can distort valve cover.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: Oct 2017 Posts: 214 'Bolter | | 'Bolter Joined: Oct 2017 Posts: 214 | Awesome thanks, I could only find the nuts which I already have
1953 Canadian GMC 9314 w/ (factory) Chevy 235
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