I recently replaced the water pump and timing belt of my 04 XC70 165k. First time I've done this job. I was losing coolant from the water pump. Mechanic who did timing belt 70k miles ago did not fully screw-in one of the 7 bolts of the WP and coolant must have leaked thru gasket. Anyway, I believe I replaced and installed everything correctly (TB, WP, Tensioner and idler pulley and drive belt and tensioner). While the old belt was still on I turned the crank to TDC and marked the setting in various spots. Before installing the new TB, I noticed the intake cam was forward by 1 or 2 teeth. I moved it back to the TDC mark and installed the TB. After job was done, car started fine and runs fine. No messages on dash. I've also driven at least 100 miles since and ran fine. Yesterday however as I was driving around town I heard a kind of intermittent faint rattle coming from the front. After I pulled in to my driveway I kept the car running and popped the hood to listen closely but engine was nice and smooth. No rattle.
I googled symptoms of improperly installed TB and most that came up was valve issue. How do I check if I did the job correctly? Thank you.
Timing Belt Question
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dikidera
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These engines are not timed at TDC, but slightly before for crankshaft(there is a notch when you remove the crank pulley/harmonic balancer. The intake camshaft if with a VVT hub can move independently(within a limited range) from the camshaft itself.
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volbul2
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Sorry but I don't know what you mean by "not timed at TDC". One thing I forgot to mention was I verified the timing marks again at least 2X after I installed the TB by turning crank. The cam marks lined up at TDC.
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volvolugnut
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In the old days, engines were timed and valve trains set based on the reference position Top Dead Center (TDC). This was the position when the first cylinder reached the fully extended position at the top of travel.
If you set the belt to time the valves based on the timing mark on the crank and the paint marks on the timing belt, you should be good for valve position.
The rattle may be some other thing you left loose.
volvolugnut
If you set the belt to time the valves based on the timing mark on the crank and the paint marks on the timing belt, you should be good for valve position.
The rattle may be some other thing you left loose.
volvolugnut
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Volvo: 2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple Volvo parts cars.
Mercedes: 2001 E320, 1973 280, 1974 280C, 1989 300E, 1988 300TE, 1979 300TD, parts cars.
2009 Smart Passion
Ford: 1977 F350, 1964 F150 (2), 1938 Tudor Sedan
Farmall tractors: 1956 400 Diesel, 1946 A
And others.
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