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| | | | Joined: Dec 2011 Posts: 112 'Bolter | | 'Bolter Joined: Dec 2011 Posts: 112 | New to me, 72 K10 w/org 350 with about 140k miles on it. Runs ok but a bit ratty. New plugs, wires, cap (has later HEI distributor). Suspect Qjet carb needs help but if functioning for now.
It appears to have a replacement radiator in it which leads me to believe there may have been some overheating conditions in its past.
Ran compression test on it & all cyls good at 90# except cyls 2 & 4 test to 20#.
Checked rear differential yesterday and found it about 2 qts low!--suspect the PO did little or no maintenance!
Been along time since I played around with older engines and do consider myself a novice when it comes to diagnosis of engine problems.
I suspect possibly a head gasket problem between the two side by side cyls.
Any help, thoughts or ideas reference this problem would be appreciated!!
Thanks in advance for your help!
delky dave in WYO
1957, 3100, v8
2016 gmc 4wd
| | | | | Joined: Feb 2004 Posts: 29,831 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,831 | The next test should he a cylinder leakdown check. Pull all the spark plugs, get each cylinder in the firing order at top dead center with both valves closed, and put air pressure into the cylinder through the spark plug holes. Listen for leakage at the carburetor, tailpipe, and adjacent cylinders to find out where the pressure is going. Lock the crankshaft with vise grips clamped onto the flywheel to keep the air pressure from spinning the engine in case you miss TDC by a little.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | Delky,
An off topic question for you. We have THREE 1970 Blazers right now--two for rebuilds and one for parts. Two of them have the topper and the fiberglass is in sorry shape. Do you know of anyone that works with these units? Price is not a show stopper. Thanks; Evan
Evan
| | | | | Joined: Feb 2004 Posts: 29,831 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,831 | Evan, if there's a good boat shop in your area, they're more likely to have skillful fiberglass techs than most body shops do. One repair technique we used to use on fiberglass boats to repair damaged gel coat was to mix up enough to recoat a thin spot and stretch heavy-duty Saran Wrap like a restaurant might use over the repair while it was curing to smooth it out. Then feather-edge sand the repair to blend it into the rest of the surface, prime, and paint.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2011 Posts: 112 'Bolter | | 'Bolter Joined: Dec 2011 Posts: 112 | Hot Rod Linc
Thanks for your help===bad exhaust valves in those two cylinders. Tearing down today for further check and probable valve job. Thanks again!!!
Delky
1957, 3100, v8
2016 gmc 4wd
| | | | | Joined: Feb 2004 Posts: 29,831 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,831 | I've been using that test for over 50 years- - - -it makes for a very quick diagnosis with little if any teardown. Have fun!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Dec 2011 Posts: 112 'Bolter | | 'Bolter Joined: Dec 2011 Posts: 112 | Hot Rod Linc
Sounded like a wind storm at the tail pipe! Pulled the heads & found the exhaust without seats! Valves looked real bad of course!! Thanks for the help once again!!
Delky
1957, 3100, v8
2016 gmc 4wd
| | | | | Joined: Dec 2011 Posts: 112 'Bolter | | 'Bolter Joined: Dec 2011 Posts: 112 |
1957, 3100, v8
2016 gmc 4wd
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