Burnt wires
Thread Starter
Drifting
Joined: Jul 2005
Posts: 1,375
Likes: 2
From: Austin Texas
Burnt wires
I pulled exhaust manifolds recently as part of a head repair. I note that there are some burnt wires under the passenger side manifold. There is a section of wiring harness that goes under that side, and the sleve is burned and melted, and one of the wires is showing copper. I can patch it up easily enough... But I'm afraid it'll burn through again. The wiring harness looks like a total PITA to replace, and I'do not want to. Anyone else seen this? Potential fixes?
Drifting
Joined: May 2005
Posts: 1,590
Likes: 1
From: Littleton Colorado
I burned my O2 sensors after a header install, and after that I warp them. Used left over header wrap and works great so far. There are a few options on cooling tapes and such to wrap the wires. I just fully wraped my headers, so I'm thinking that shoud help the situation. I'm still looking at wraping the starter wires and such that get close to the headers.
Race Director
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
I found the same thing when I did my header install... ie the stock manifild heat had melted the plastic loom and the insualtion on the wiring.
I cut the wires, as far from the heat source as possible, slid shrink tubing onto each separate wire, shrunk it, put new plastic loom over it and them put heat resistant cloth socks over the whole thing.
I found those socks( tubing) available at a local speed shop. ( silver colored cloth tubing available by the foot off a roll)
Once that was all in place, I slide some more shrink tubing in place, I resolderd the cut wires and shrunk the tubing then wrapped with high heat electricians tape for added measure.
I cut the wires, as far from the heat source as possible, slid shrink tubing onto each separate wire, shrunk it, put new plastic loom over it and them put heat resistant cloth socks over the whole thing.
I found those socks( tubing) available at a local speed shop. ( silver colored cloth tubing available by the foot off a roll)
Once that was all in place, I slide some more shrink tubing in place, I resolderd the cut wires and shrunk the tubing then wrapped with high heat electricians tape for added measure.
Instructor
Joined: May 2005
Posts: 145
Likes: 0
From: Nevada Texas
Just a note, if you're going to splice wires and use shrink sleaving over them, put a very light coating of RTV sealant over the exposed copper then shrink the tubing over that,. Makes for a insulated and watertight seal, eleminating copper corrosion in the solder area.
Le Mans Master
Joined: Dec 2006
Posts: 7,251
Likes: 16
From: Phoenix Arizona
Just a note, if you're going to splice wires and use shrink sleaving over them, put a very light coating of RTV sealant over the exposed copper then shrink the tubing over that,. Makes for a insulated and watertight seal, eleminating copper corrosion in the solder area.
very good! 
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Just a note, if you're going to splice wires and use shrink sleaving over them, put a very light coating of RTV sealant over the exposed copper then shrink the tubing over that,. Makes for a insulated and watertight seal, eleminating copper corrosion in the solder area.
Peter
