hey i need some input on the timeing chain.i have the new timeing chain set for 85 22r, but need to know what im getting in to before i start.dose anybody have a step by step manual? i want to try to get it done this weekend i hope
Most engine wear on any engine occurs at startup with that said the R series Toyota engines
such as the 18R,20R and 22R all use a timing chain which it's tension is supplied by hydraulically driven timing chain tensioner which has it's oil pressure build up few seconds after the engine has started therefore the timing chain rubs on the driver's side brown colored nylon/plastic timing chain dampener or guide and after so many miles (140-170 000 miles in the city with the average 4 starts per day) the driver's side guide breaks through causing the chain to rub on the timing chain cover for the first few seconds upon startup and when driving in 5th gear and letting off the gas.
Usually by this point the other timing components such as the camshaft sprocket, crankshaft sprocket and chain have their specs out of tolerance and hence must be replaced as well. The tensioner sometimes sticks due to dirt build up and other problems arise as well and must be replaced as well, all of those parts are sold in the aftermarket world as a "timing chain kit" which also include gaskets and a front oil crankshaft seal. Toyota on the other hand for some reason does not sell the parts as a kit but as individual parts which would cost around $400+ and from all of the reading I have done on many Toyota 4-Runner/pickup discussion sites I have come to the conclusion that many experienced off-roaders who cannot afford to buy all of the genuine Toyota timing parts instead buy the chain and tensioner from Toyota and the other parts from aftermarket as a kit but of course don't use the aftermarket chain or tensioner.
The best brand of aftermarket timing chain parts to use on the 20R & 22R series Toyota motors are:
you can also remove the valve cover and take a flashlight and see if the driver's side timing chain dampener or guide wore through.
You can bend 1 to all 8 valves and have timing cover eaten through if you wait and then coolant and oil mix together to give you butterflies in your stomach. You can do a fluid analysis on your engine oil by going to any Caterpillar and buying a fluid analysis kit for around $15-20 and taking a sample of your old oil.
Finally these sites explain the timing chain replacement well:
Make sure you use 50% Toyota long life red low silicates radiator coolant to reduce corrosion build up on the tiny water bypass passages found in the aluminum cylinder head and preferably 50% distilled water, rain water or snow water.
I would pour the mixed coolant & water combination into the thermostat hole until full then install new stat and stat cover/hose tighten up. Start the truck on an incline or car ramps and start pouring mixed coolant & water combo into radiator almost to the neck wait for stat to open which is about 10 minutes of idling then turn your heater on to high and hot (as well as your back seat heater controls for those with 4-Runners) and rev the engine back and forth but not too high. Re-top the coolant and continue to do so for one or more stat cycles.
Finally turn the heater control from hot to cold repeatedly and from high to low and place about half mixed coolant & water into overflow bottle and place stat cap back on, take for a test drive.Once engine has cooled off check the rad level and overflow bottle.
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