Service Procedure - Timing Verification: Notes
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
| 1 - TIMING CHAIN COVER |
| 2 - CRANKSHAFT TIMING MARKS |
CAUTION:
The 3.7L is a non free-wheeling design engine. Therefore, correct engine timing is critical.
NOTE:
Components referred to as left hand or right hand are as viewed from the drivers position inside the vehicle.
NOTE:
The blue link plates on the chains and the dots on the camshaft drive sprockets may not line up during the timing verification procedure. The blue link plates are lined up with the sprocket dots only when re-timing the complete timing drive. Once the timing drive is rotated blue link-to-dot alignment is no longer valid.
Engine base timing can be verified by the following procedure:
- Remove the cylinder head covers. Refer to the procedure in this article.
- Using a mirror, locate the TDC arrow on the front cover. Rotate the crankshaft until the mark on the crankshaft damper (2) is aligned with the TDC arrow on the front cover (2). The engine is now at TDC. See Fig 1.
1 - LEFT CYLINDER HEAD 2 - RIGHT CYLINDER HEAD - Note the location of the V6 mark stamped into the camshaft drive gears (1,2). If the V6 mark on each camshaft drive gear is at the twelve o'clock position, the engine is at TDC on the exhaust stroke. If the V6 mark on each gear is at the six o'clock position, the engine is at TDC on the compression stroke. See Fig 2.
- If both of the camshaft drive gears are off in the same or opposite directions, the primary chain or both secondary chains are at fault. Refer to TIMING BELT/CHAIN AND SPROCKET(S) .
- If only one of the camshaft drive gears is off and the other is correct, the problem is confined to one secondary chain. Refer to TIMING - SINGLE CAMSHAFT .
- If both camshaft drive gear V6 marks are at the twelve o'clock or the six o'clock position the engine base timing is correct. Reinstall the cylinder head covers.