Friday, November 4, 2016

Exhausting Work

Night before last, I finally got some time to work on Glinda’s leaky exhaust. I had thought that the donuts (gaskets) between the exhaust manifolds were the only failed parts in the system, so I backed Glinda up on the ramps to do a remove-and-replace (R&R). After letting the pipes cool down, I unbolted the two manifold flanges and the hanger strap and slid the exhaust assembly out from under the car. The next chore was to clean off the old gaskets which had hardened to into rings of rock. My quarrying tools of choice were hammer, small cold chisel, and a couple screwdrivers. Way too many minutes later most of the old stuff was off and I was able to wirebrush the rest off at the bench grinder. I’d previously purchased a couple new gaskets from Gary the Corvair guru a week ago, so I slipped them on and slid myself and the assembly back under the car and bolted everything back together. With the engine fired up, I immediately noticed I hadn’t solved the entire problem. There was still exhaust escaping someplace other than the tailpipe. I slid under the car again and felt around until I found pulsing hot air from the top side of the joint where the straight pipe goes into the crossover pipe. Out came the assembly again and my MIG welder made molten metal closing up the crack. Sadly, the last extraction broke the rubber piece of the muffler hanger, so I had to R&R with a GNP that I had sitting in a cubbie. Once the assembly was properly bolted into place, the only exit available for the exhaust was outlet of the Flowmaster. The car sounds soooo much nicer now.

One other quick task I did before calling it a night was to get out my Vernier calipers and measure the journals of the crankshaft I’d removed from Corsavert. For the mains, I got 2.0985 for all four. The manual says they’re acceptable between 2.0978 and 2.0988 for #1 and #2 and 2.0983 and 2.0993 for #3 and #4, so I’m good. For the rods, I got a range of 1.798 to 1.800. The manual says they need to be between 1.799 and 1.800, so I’m a thousandth low on two. The reason I did this was I wanted to see if I could buy standard bearings and begin assembling a 140 horsepower engine for Glinda. I think I’ll buy the standards and cross my fingers that my measurements are a hair off. The proof will be when I check the assembly using Plastigauge. That’s more accurate than a Vernier caliper.

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