Cracked Cylinder Diagnosis: Remove the Wiring Harness

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Part of the video series: Diagnose & Repair a Cracked Cylinder Head

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Summary: Remove the wiring harness, including all of the fittings and fixtures that go with it, to disassemble the engine to diagnose a cracked cylinder head; learn how in this free auto-restoration video.

Views: 931 | Tags: repair, body, shop, car, head, automotive, restoration, gasket, cracked, cylinder, auto repair, car repair, classic cars

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About the Expert

Doug Jenkins Doug, of “Doug Jenkins Custom Hot Rods”, not only servers the entire nation, but even customers outside the U.S have found the shop's services indispensable. ... read more

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Video Transcript

Cracked Cylinder Diagnosis: Remove the Wiring Harness

DOUG JENKINS: Hi. I'm Doug. I work with 20 great guys in St. Louis at Doug Jenkins Custom Hot Rods, and we're going to do some work for you today on Expert Village. The next step in getting this engine torn down so we can find the coolant leak is to remove the wiring harness, the engine-wiring harness. There's a lot of fixtures and fittings and sensors and little ground wires and stuff that go along with the engine harness. Now, Dan is removing the distributor cap with all the wires just to get them out of the way. You can go ahead and leave them on if you want, but it's--the cleaner job you do here, the fewer wires you got laying around, the better everything is going to go, so he gets that done. And he's going around and unplugging. What he just did there was a temperature sensor or a coolant-temperature sensor. This harness he's unplugging right now is a distributor control; that'll send a signal to and from the distributor. Usually, the engine wiring harness will be long enough and well enough organized, you can lay it off to the side as well. Taking the leads off of the coil so you can get the primary and secondary wires off the coil. The nut there is a special size. You may not have it in your toolbox. They use a special size nut for the coil often. Now, he's loosening up a fitting there that we used when we first installed the fuel injection to use as a ground-wire anchor. So a couple of the wires in the wiring harness are just wired to that nut there.