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Jul 21st, 2025 | | | | Joined: Dec 2003 Posts: 265 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 265 | The other day I was driving a new project home that sounded great around town but once on the freeway, towards the end of the trip it developed a knock. Oil pressure showed on the gauge but wasn't overly high. I've also noticed a cough in the exhaust on the left bank at idle. I'm guessing maybe bearings and an oil pump?
This was a trade that is basically a freebee and it's a '67 Ford so I'd like to get it running well and trade it off for another GMC. | | | | | Joined: Jan 2009 Posts: 1,644 Shop Shark | | Shop Shark Joined: Jan 2009 Posts: 1,644 | Mabe a stuck exhaust valve or a bent push rod or broken rocker You might want to check that frist .
Pete | | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | Don't know if this could be related or not, but have you checked and adjusted the valves?
Grigg | | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | Well, now I see my hunch is Pete's too..
Let us know what you find,
Grigg | | | | | Joined: Dec 2003 Posts: 265 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 265 | I'll take a look tomorrow and let you know.
Thanks | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | I'm wondering if a piece of carbon broke loose & was sitting on top the piston & then part of it got into the exhaust valve.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Aug 2007 Posts: 1,859 Grumpy old guy playing with trucks, cars, and boats | | Grumpy old guy playing with trucks, cars, and boats Joined: Aug 2007 Posts: 1,859 | If its a 302, change the plugs. When a plug goes bad on a 302, it sounds like a rod is out. Dont know why, just know it is.
The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me
| | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | Are we still on the same page? I know both GMC and ford offered a 302, which one are we talking about? | | | | | Joined: Dec 2003 Posts: 265 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 265 | | | | | | Joined: Dec 2003 Posts: 265 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 265 | I pulled the valve covers today and it has hydraulic lifters with no valve adjustment at all??? Adjustment determined by push rod length only? No broken lifters. I did notice that the valve covers and heads are extremely gunked up which makes me wonder if a lifter is gummed up. I might get a can of engine flush later today as see cleaning it out makes a difference on the cough and the oil pressure issue. | | |
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