Jamesrpm
Oregon Coast
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dons2346 wrote:Jim 83 Itasca has it.
The chain will go "forever" but the el cheapo aluminum timing gear will wear all the teeth off. It will happen all of a sudden, without warning. The aluminum gear with the plastic fillers is used to keep gear whine down.
Brother pulled into fuel up , when he tried to start no luck,No noise no loss of power ,nothing . Yep, teeth sheared off timing chain gear .
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smkettner
Southern California
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sc3283 wrote:you DO NOT I repeat DO NOT want a gear drive...why that was suggested to you..I haven't a clue
Just explaing the differences. I made no suggestions as what to buy except to say if you have paid to take off most of the front to do a water pump that I would recommend some sort of new chain.
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Les Curren
U.S.A.
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OK. Never seen a timing chain that looked like that double row chain.
Is there any way to determine which chain is on which engine? That is without removing the timing chain cover.
My engine is the 1995 GMC 454 in a 1996 28' Itasca that has a dry weight of 14,300 pounds.
I am assuming from the looks of the gears in the picture of the double row chain that they are steel. They certainly would not put aluminum or nylon gears in conjunction with a chain that husky. At least I hope they are hardened steel.
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Suzy Q Antiques
DEVORE CA
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also,open road driving isn't as hard on a chain as around town and i would think that most m.h. drivers are not as quick on the gas as in a smaller vehicle.
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bill h
coastal reconquista
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On many GM vehicles, the cam sprocket had a layer of nylon over teeth for quietness. It would usually fail before the metal parts.
As others have said, steady driving at RV engine speed is not too hard on OEM cam drive components. It's the manual gearbox hot rodders who have the most problems.
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427435
Rochester, Mn
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I lost the timing chain gear on my much older '67 Vette at around 100,000 miles. The gears were aluminum. The result was 16 bent pushrods and valves and 8 dented pistons----not a pretty sight!!
Mark
2000 Itasca Suncruiser 35U on a Ford chassis, 65,000 miles
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jerold222
Southern Minnesota
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I was wondering if the 454 was a zero clearance engine. There may be variations over the years but bent valves and broken pistons would merit an early change to the timing chain.
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dougsee3
Calgary AB
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Trucks and or Motorhomes do not have a nylon gear the cars have they are steel.
It also would have been replaced at the rebuild.
With that they still do wear under high loads. I do not think a replacement would be worth the expense unless can you do it yourself. At that mileage or higher if the water pump was being replaced I would consider and have the timing chain and sprockets replaced at the same time.
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Capt.Storm
Brockport NY.
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sc3283 wrote:1st off..your timing chain will last a very long time if you have not neglected your oil changes. If you have then you may want to think about chain replacement
Your 454 is either a gen 5 or gen 6 (I can't remember for sure exact yr of change)
the gen 5 and gen 6 engines are different than the old tradition 454 that was used from 1970 to 89-90.
There are internal differences between all 3 versions of the 454.
I do not know of them ever coming with double row timing chains from the factory
you DO NOT I repeat DO NOT want a gear drive...why that was suggested to you..I haven't a clue
timing chain slop can be checked without engine disassembly...remove dist cap...rotate crank back and forth to see how much movement is in the crank before the rotor turns...if major movement then chain is sloppy and should be changed..along with both gearstiming chain slop can be checked without engine disassembly...remove dist cap...rotate crank back and forth to see how much movement is in the crank before the rotor turns...if major movement then chain is sloppy and should be changed..along with both gears
Spot on!
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