Now I'm confused
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Joined: Oct 2010
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Now I'm confused
I have two issues and I think they are both related to timing. I'm just not smart enough to figure it out.
Issue #1 - My truck over heats after I drive it for a while. A slow temperature rise from what I can tell. I have a new RT-139 thermostat. The engine doesn't get too hot but the radiator fluid boils and spills out through the overflow. The fluid is doing it's job but it pays the price for it, so-to-speak.
Issue #2 - The truck stumbles when I mash the accelerator.
This is where I'm confused. The heat is usually from the timing being retarded but the stumble is usually caused from to much advanced timing. Or, I could be wrong all together. It wouldn't be the first time.
Issue #1 - My truck over heats after I drive it for a while. A slow temperature rise from what I can tell. I have a new RT-139 thermostat. The engine doesn't get too hot but the radiator fluid boils and spills out through the overflow. The fluid is doing it's job but it pays the price for it, so-to-speak.
Issue #2 - The truck stumbles when I mash the accelerator.
This is where I'm confused. The heat is usually from the timing being retarded but the stumble is usually caused from to much advanced timing. Or, I could be wrong all together. It wouldn't be the first time.
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I've put a timing light on it but the pointer is no where near the degree marks on the balancer. It has a cam in it. If I try to retard it far enough to hit the marks on the balancer then the truck just flat out dies. It's advanced far enough to where the vacuum advance on the distributor is touching the top coolant inlet.
How do I check to see if the exhaust is mixing with the coolant?
How do I check to see if the exhaust is mixing with the coolant?
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Joined: Nov 2007
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From: Denver Metro Area, CO
Do a google on 'leak down test' there are sites out there with pictures.
Basically, you fill each cylinder - one at a time - with compressed air, and then check for leakage past the rings, valves & head gaskets.
A true leak-down test measures the percentage lost over a certain amount of time and requires two gauges but you don't need to go to that extent; I use the hose from a friend's compression gauge (doesn't have a check valve in it) and hook it up to my air compressor.
Bubbles showing up in the radiator will generally be from a leaking head gasket.
I understand there are also chemicals that can be obtained at an auto parts store that you dump into your coolant that somehow tells you if exhaust gases are present or not, might look into that.
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I've put a timing light on it but the pointer is no where near the degree marks on the balancer. It has a cam in it. If I try to retard it far enough to hit the marks on the balancer then the truck just flat out dies. It's advanced far enough to where the vacuum advance on the distributor is touching the top coolant inlet.
How do I check to see if the exhaust is mixing with the coolant?
How do I check to see if the exhaust is mixing with the coolant?
Elder User
Joined: Jan 2011
Posts: 831
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From: Tanilba bay NSW Australia
You'd have to rotate the crank so both valves on the cylinder you're testing are shut otherwise it just goes to the manifolds. Or you can undo the rockers, thats easy if they're non adjustable, just be careful doing them back up.
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