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2004 S60 2.5T- Timing belt tensioner wiggles while running

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Kara503
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2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by Kara503 »

Car like the title states- just did the timing belt job about 4000 miles ago. Never noticed this before, but now I am running without a timing belt cover and happened to look down at the tensioner while the car was running. The dial indicator that you use to set tension is wiggling side to side (less tension to more tension, looks like a hand on a clock moving back and forth) as the car runs.

I'm not 100% certain if the tensioner is causing this, but occasionally the car feels like it has a VERY slight misfire one acceleration, but it is not misfiring. Like a slight pulsing in power output.

Is the wiggling of the tensioner normal? I can post a video if need be. the center bolt is nice and tight, I'm just worried this could be a sign the tensioner is defective?

Thanks!
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by oragex »

Not only not normal, but I suggest not driving the car until fixing this. Not willing to sound scary, but I hope the hesitation is not due to the valves hitting slightly the pistons.

What brand was the timing belt kit? Also possible the tensioner wasn't properly set (or tightened).
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by chrism »

It sounds like the tensioner is doing its job and reacting to something else that is causing a cyclical tightening/slacking of the belt. You could hand crank the crankshaft clockwise and see if the tensioner indicator is swinging in sync with each cam revolution, each crank revolution, or each time the belt makes one complete lap.

Do you see any wobble in either of the cam sprockets when it's idling?
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by Kara503 »

I sure hope the valves arent contacting the pistons!! All timing marks line up and when the engine is not running the tensioner hand is juuuuust to the left of the window it is supposed to be in- I'll remedy that tonight, as well as roll the engine over a few times to triple check timing and see if the tensioner behaves oddly. As well as watch it idle to see if anything else looks off.

Is it possible the VVT is causing it to do that?

Forgot to mention, Contitech timing belt kit, with INA roller and tensioner, Aisin water pump.
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by oragex »

That sounds about right with the hand if the engine is cold, with hot engine it should be about side by side with the right 'leg' or so. The bolt don't take much torque - only 15 ft.-lb
Does the belt run without moving sideways over the cam gears? Does it stay about in the middle of the gears?

Which engine is this? Any work on the cams at the time for the timing belt?
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by Kara503 »

Engine is a B5254T2, 143k miles. Will report back this evening on the belt and how all of the components behave. I only did the standard timing service, no work on the Cam seals or the VVT hub itself (I think my car only has exhaust VVT). Now that you mention it, though, there does appear to be a massive oil leak on the front side of the engine... subframe under the crank is coated in oil, and I cleaned it up to track any leaks when I did the timing job.

I plan on diving into the car next weekend for the PCV service anyway, so I'd address anything related to this at that point. Maybe it would be a good time to reseal the VVT solenoid, hub, and cam seals?
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by oragex »

Maybe test the pcv (Youtube). Is the tensioner the correct one? It was changed around 2004 https://www.fcpeuro.com/Volvo-parts/S60 ... Tensioner/
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by Kara503 »

Should be the correct tensioner, my engine is S/N 33xxxxx and FCP says the tensioner I bought starts at 31xxxxx. PCV I am doing due to a dipstick that starts smoking heavily 5 or so minutes after starting. I'm fully counting on having to drop the oil pan to clear out some gunk, too...
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by oragex »

Often times the pan is not clogged (but needs be tested by blowing air), smoke through the dipstick may simply mean the box has failed inside (I suspect these fail after some 100k miles). The less fun part is the kit cost for the turbo engine, but then again, not much choice. The sooner, the better.

www.youtube.com/watch?v=rRecTJnTJKc
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Re: 2004 S60 2.5T- Timing belt tensioner wiggles while running

Post by Kara503 »

Alright, just took a peek at the car idling. There might be just a tad of wiggle in the exhaust cam sprocket. This car does have VVT on both int and exh. The belt stays more or less in the middle while idling, but you can see it moving side to side juuuuuust a bit. I would say overall less than 2mm of side to side motion, maybe about 1. No abnormal movements/wobbling I can see on the crank, water pump, idler, or intake cam. Its pouring rain so I will take the wheel off and hand crank the engine with some,closer observation tomorrow. Thank you both for the suggestions :)

Oragex, I have been meaning to ask, do you have any other pics of the s60 in your avatar picture? It looks like a beautiful color!!
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