| Timing Chain Replacement [message #213606] |
Sun, 07 July 2013 11:52  |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
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Over the past 10 years, the fuel mileage went from around 9 or 10 down to about 7 or so last fall. I figured either my driving habits were getting worse or something was wearing out. A couple years ago, I replaced the cracked intake manifold with an Edelbrock aluminum intake and I also rebuilt the carb and installed an electric choke. The choke never seemed to be in proper adjustment and the GMC was really cold blooded.
I figured that I did a poor job at rebuilding the carb and the choke should be replaced with one of those electric thermostat chokes. The GMC has about 120 000 on the clock so I decided this spring to replace the timing chain and water pump. The job went pretty well and Jim K was able to help me out after I twisted off my fuel line. The chain was really loose. It probably would have jumped a tooth this year had I not changed it.
Now that I have it back on the road, it runs completely different. The engine doesn't labor holding 60 MPH and it cruises easily. It fires right up when cold and it doesn't sputter and die when I put it in gear. I should have changed the timing set back when I first saw a decrease in mileage. Now I know better.
I can't wait to take it on a longer trip to see what the mileage is now.
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