Hello everyone and greetings from New Zealand.
A 1986/92 Cormorant Clipper Motor home has come up for sale here. We really like the look of it and were just about to buy when we came across the following article, (Wikipedia), whilst checking to see whether the van has a cam belt or timing chain
We would really like to hear the members views/experience on this....
Toyota swapped the dual row timing chain used in older engines for a single row chain with plastic guides in 1983. This system reduced drag on the engine, but was inherently problematic. Every 80,000 to 140,000 miles, the chain could stretch to the point that the hydraulic-operated chain tensioner can not take up any more slack. When this happens, the timing chain impacts driver's side chain guide, breaking the plastic within a few hundred miles of driving. If the engine continues to be operated after the guide breaks, the chain will stretch rapidly (an unfortunate characteristic of single row chains.) The loose chain causes inaccurate ignition timing which usually results in noticeable rough running. In continued operation, the chain can jump a tooth on the drive sprocket or break entirely, with either case resulting in engine damage from valve-piston collisions.
Also, the stretched chain will slap against the side of the timing cover due to the broken guide, and can wear through the cover and into the coolant passage behind the water pump. This will cause coolant to drain in to the crankcase / oil pan, possibly causing damage to internal engine components such as the bearings, crankshaft, camshaft as well as damage caused by overheating due to the lack of coolant (since it has drained into the engine oil).
I imagine the problem would be avoided easily by getting the chain changed well before it was due?
Any other things we should know about?
Could be interesting driving a left-hand drive vehicle here!
Cheers all