Q: What to do when crankshaft wont turn with wrench to line timing chains

asked by on

What would cause the crankshaft not to turn with a wrench to set the timing chains?

My car has 137000 miles.
My car has a manual transmission.

If you are trying to turn the crankshaft while the timing chain is off, you may have an open valve that is hitting a piston. This can be a big deal and you can damage the valve if you try too hard. Normally you would set the engine up on the timing marks before removing the timing chain, and not turn the crank or camshaft until the new chain is installed. If the crank and cam are out of sync the valves can interfere. You can get everything lined back up by setting the crank in a position where all the pistons are down. 90 degrees off of TDC works for this. If you can’t turn it in one direction try the other. Then and only then can you turn the camshaft to get it into timing position. After the cam is set, you can bring the number one piston up to TDC by turning the crank. If you don’t have a lot of experience working with overhead camshaft engines, it’s easy to get into trouble working on the timing chain. It may be best to get professional help by contacting a mechanic and having someone look it over and help you figure out what to do.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What to do when crankshaft wont turn with wrench to line timing chains

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: One of my fuel injector burned out what's wrong?

If you are referring to the electrical solenoid within the injector, like any electrical part it can fail due to degradation of the insulation, wire breaks and so forth. The injector can be tested while still on the car and...

Q: Check engine light is on and obdII said O2 sensor. 2002 Chevy Silverado 1500

Hi there - some problem codes require a certain number of "drive cycles" before the ECU will turn off a Check Engine problem code, O2 sensors often being one of them. If your truck is running well, ignore the light...

Q: Harmonic balancer broke replaced now won't start

There are two main possibilities. Depending on how or why the balancer failed (e.g., did it fail suddenly accompanied by the car engine completely stopping), it is possible the timing belt has slipped or is even broken. It is also...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...