| David Wood's 403 [message #333992] |
Mon, 25 June 2018 17:31  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma:
|
Senior Member |
|
|
As some of you may remember, Dave Wood overheated his coach on the way to the Tucson GMCMI back in April. He was towed to the KOA where II helped diagnose the initial problem as a heater hose that had been riding on the AC pulley and had worn through.
I sent Dave and his friend out for some supplies and changed out the hose for him only to find that the problem was much worse than just a worn through hose. When we filled it back up with coolant, it was steaming out of the exhaust rather badly and when we removed the radiator cap, there was quite a bit of pressure and air bubbling out of the radiator.
Alex and Miguel were called over only to confirm the diagnoses of a cracked head or blown head gasket. At the end of the rally, the coach was towed to Calypso Automotive where my mechanic friends, Ron & Jim agreed to replace the heads. Unfortunately, the job turned into a much bigger deal than they had anticipated or wanted to do. When Jim pulled the heads off, he found two burned pistons (Holes burned in the top edge of the #4 and #5 pistons)
The engine needed to come out and a complete rebuild needed to be done. The coach is back up and running as of Friday evening,. I test drove it today at Jim's request and it runs great. There are still a few tweaks needed, but ti is back together and I understand Dave will be back in Tucson Wednesday to pick it up, put a hundred or so miles on it, bring it back for another oil change and then drive it back over the mountain home to San Diego.
Attached is a link to a couple of photos I took of the internal damage and the suspected cause of the severity of the problems. There was some kind of snake oil injector(???) in the PVC hose that I noticed was sucking in a LOT of air after I fixed the heater hose. I believe it was causing an overly lean condition in those two cylinders, which combined with the overheating, caused the burned pistons.
http://www.gmcmhphotos.com/photos/g7162-david-wood-27s-403.html
If anyone can identify the "snake oil injector" I would be curious as to what it might be and what it's supposed function was. So far no one that has seen it can identify it.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
