| [GMCnet] Interested in avoiding bebuilding your 403/455 [message #350574] |
Mon, 09 December 2019 00:44  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma:
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Senior Member |
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Sorry. I had to speak out on this one. The plastic teeth on the cam sprocket is a grenade that WILL go off. The engine will run perfectly till the bang. GM never considered back then. That people would still be driving these GMC's 45 years later.
Some say that you need to look for signs of true mileage. The condition of the brake peddle is a good one for cars. They stop a lot. We stop very seldom per miles driven. I've seen the brake peddle in a 300,000 mile GMC that looked new. Look at the condition of the suspention. Here again. Some get maintained. Some don't. At this point. It's not the miles driven. It's TIME.
It's simple. Plastic gets more brittle with age. Here's how that sprocket will come apart. Once the plastic breakdown starts. The first shavings start to plug the oil filter. As that plugging of the filter media progresses. The oil filter by pass valve. Starts to by pass more, and more contaminated oil. This is the start of when the main/rod bearings start to be destroyed.
Some say. If it's working fine. Drive it. Or. Not brook. Don't fix it. There's value in that thought. But in this case. I think that putting a good running engine at risk. Has no value. Owners choice. Not my Monkeys. Not my circus.
We've had a GMC since 2003. 42 states, and some of Canada. ( A lot of that first 78 Royale is under this second 78 Royale. ) We've never been stranded to the side of the road. Then towed. ( The fire in 2015. We never got the fire recall.) So can't blame the GMC there.
These 45 year old GMC's can be extremely dependable. There are just a few thing that need to be done to accomplish this. An no money to do it. So. Sorry for butting in. I need to go back under my rock.
Happy trails to all.
Bob Dunahugh
78 Royale
4 COPO Yenkos
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