Question about 1998 Volvo V70

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"98 Volvo V70 2.4L 20 Valve no turbo. Timing jumped on previous owner bought car for steal. both cams turn freely, exhaust does have quite bit more resistance. With the timing belt off and spark plugs out I cannot turn crankshaft even 1/4 turn by hand. I drained oil no metal or water in it. Anybody have ideas? Should i just drop in a used engine?

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  • Volvo Expert
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These are interference engines. If the timing belt was never replaced and the car has over 120000 miles on it, I bet the belt broke and then the pistons hit the valves and you have trouble.

Without spark plugs in, you should be able to use a large wrench to turn the engine. If there's any resistance, you probably have a piston touching a valve.

What I would do is to remove the valve cover and possibly the cams, then with all the valves closed, see if I can turn the crank over.
You might be able to get a small inspection camera down the spark plug holes to look in the cylinders, and maybe even with all the valves closed do a leak-down test to see if the valves are sealing.

If you can get all the valves to seal, they're not bent or broken AND the pistons are sealing well (meaning, no holes in them). Then you could adjust the timing and put a new belt on it and see if it runs.

Actually - that might be the best way to start. Align the cams and put a belt on, then rotate the engine to where you can leak-down test each cylinder. Any big leaks and you have a problem.

A used engine might be a good idea, but I'd verify there's a problem first. You CAN get lucky and the belt broke when the engine was started and nothing got damaged.

Posted on Dec 04, 2014

  • Daniel Wood
    Daniel Wood Dec 05, 2014

    Awesome I just wanted to get some insight I've only ever worked on one interference engine and it was in college an old Detroit diesel I think. Not much experience with these I'll tear down and run some tests. Thanks for your knowledge.

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  • Volvo Master
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Is the Volvo engine an interference engine? Some are and some aren't. On interference engines, when the timing is lost, valves & pistons collide and there is damage - bent valves at least. If an interference engine, the valves could be touching the pistons and that would limit your turning the cam further.

Posted on Dec 04, 2014

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