Camshaft Timing Marks

Here are diagrams to help you see how to do the job check out the diagrams below. Please let us know if you need anything else to get the problem fixed.

Hello, sorry for so many questions, But I am on a 2007 Jeep Lib. I had all timing marks lined up, and the book says to rotate the engine twice and the marks should line back up. but of course they did not, both cam chains were off, everything else seem to stay lined up. Would being 1 tooth off cause this, or do i need to have all the slack at the bottom of the chain while installing the guides?

I think I answered this before here is verification if chains/timing is correct. Otherwise you'll need to rent a book on this as it's way to much for us to send to you

Hello, so this jeep came back after running fine for a week, pass. side cylinder head was recently replaced due to #6 having a bent valve. Now I have codes for multi misfire and #6 again. Ran compression test, no compression on entire cylinder head, 2,4,6, had 20psi. Driverside had 150 psi. i took off timing cover. chain was tight, with cam gear at level at 12 O'clock, crank marks lined up. Did the cam spin the pin off the gear? why lose of compression on entire side with no chain slack at all? thanks

Found the problem.. pass side cam jumped one tooth. Tensioner failed. FYI the coil packs have seals on them, if theyre crap and loose, you will get a miss fire code. the coils are junk.

Yep that's what I though it was as well, good find on that, did you get it fixed?

ok soooo... its all back together, it will start running for about 2 min perfect, then shut down.,
My guess is (if applicable) since the battery has been disconnected for so long, the security system needs to be reset possibly? theres no abnormal noises or anything, acts like the injectors are just being shut off, fuel pressure test cranking was 59psi. within spec. Any help Ken?

If the security light is flashing then yes, close all doors and lock the drivers door, then wait 5 mins and unlock the door, this should reset the system, please let me know what you find AL514

Hi everyone, Ok 2007 Jeep Liberty V6 back again, Jumped timing again. same bank (pass side). Tensioner failed.. whats up with these motors? 80 psi #6 omg help?

Are all the chain guides okay? if the chain is slapping the tensioner it will fail. Also did you hear any strange noises while the engine was running?

Best, Ken

My engine Jumped timing again. Same bank (pass side). Tensioner failed. Whats up with these engines? 80 psi #6 omg help?

since it jumped it can be a stretched chain as well as other parts. It depends on who did this and how long ago. because this is an interference engine probably valves were bent. if it was done by a shop then it should be warranted if done a short time ago.

Need to know how to set the timing and where timing marks should be at?

If you are doing the cam chains it is a fairly involved process and having the actual book in front of you is a great thing.


Using a vise, lightly compress the secondary chain tensioner piston until the piston step is flush with the tensioner body Using a pin or suitable tool, release ratchet pawl by pulling pawl back against spring force through access hole on side of tensioner. While continuing to hold pawl back, Push ratchet device to approximately 2 mm from the tensioner body Install Special Tool 8514 lock pin into hole on front of tensioner (Fig. 107). Slowly open vise to transfer piston spring force to lock pin.

Position primary chain tensioner over oil pump and insert bolts into lower two holes on tensioner bracket. Tighten bolts to 28 Nm (250 in. lbs.).

Install right side chain tensioner arm. Apply Mopar Lock N, Seal to torx bolt, tighten bolt to 28 Nm (250 in. lbs.).

CAUTION: The silver bolts retain the guides to the cylinder heads and the black bolts retain the guides to the engine block.

Install the left side chain guide. Tighten the bolts to 28 Nm (250 in. lbs.).
Install left side chain tensioner arm. Apply Mopar Lock N, Seal to torx bolt, tighten bolt to 28 Nm (250 in. lbs.).

Install the right side chain guide. Tighten the bolts to 28 Nm (250 in. lbs.).
Install both secondary chains onto the idler sprocket. Align two plated links on the secondary chains to be visible through the two lower openings on the idler sprocket (4 o'clock and 8 o'clock). Once the secondary timing chains are installed, position special tool 8429 to hold chains in place for installation.

Align primary chain double plated links with the timing mark at 12 o'clock on the idler sprocket. Align the primary chain single plated link with the timing mark at 6 o'clock on the crankshaft sprocket.

Lubricate idler shaft and bushings with clean engine oil.

NOTE: The idler sprocket must be timed to the counterbalance shaft drive gear before the idler sprocket is fully seated.


Install all chains, crankshaft sprocket, and idler sprocket as an assembly (Fig. 108). After guiding both secondary chains through the block and cylinder head openings, affix chains with a elastic strap or the equivalent, This will maintain tension on chains to aid in installation. Align the timing mark on the idler sprocket to the timing mark on the counterbalance shaft drive gear, then seat idler sprocket fully (Fig. 109). Before installing idler sprocket bolt, lubricate washer with oil, and tighten idler sprocket assembly retaining bolt to 34 Nm (25 ft. lbs.).

NOTE: It will be necessary to slightly rotate camshafts for sprocket installation.

Align left camshaft sprocket "L" dot to plated link on chain.
Align right camshaft sprocket "R" dot to plated link on chain.

CAUTION: Remove excess oil from the camshaft sprocket bolt. Failure to do so can result in overtorque of bolt resulting in bolt failure.

Remove Special Tool 8429, then attach both sprockets to camshafts. Remove excess oil from bolts, then Install sprocket bolts, but do not tighten at this time.
Verify that all plated links are aligned with the marks on all sprockets and the "V6" marks on camshaft sprockets are at the 12 o'clock position.

CAUTION: Ensure the plate between the left secondary chain tensioner and block is correctly installed.

Install both secondary chain tensioners. Tighten bolts to 28 Nm (250 in. lbs.).

NOTE: Left and right secondary chain tensioners are not common.

Remove all locking pins 3 from tensioners.

CAUTION: After pulling locking pins out of each tensioner, DO NOT manually extend the tensioner(s) ratchet. Doing so will over tension the chains, resulting in noise and/or high timing chain loads.


After installing all chains, it is recommended that the idler gear end play be checked (Fig. 112). The endplay must be within 0.10 - 0.25 mm (0.004 - 0.010 inch) . If not within specification, the idler gear must be replaced.
Install timing chain cover and crankshaft damper.
Install cylinder head covers.

NOTE: Before installing threaded plug in right cylinder head, the plug must be coated with sealant to prevent leaks.

Make 100% sure you do it correctly, the 3.7 is an interference engine and if the cams are not in time you will end up bending valves and damaging the heads.
That is why it is much better to have the book. The procedure above is the correct method though. Good luck.

I had to have both heads sent out for valve jobs. i need to know how to reset the timing on the 3.7 L V6?

Hello, here are the timing chain installation instructions in the diagrams below to help you get the job done. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers,

This is cool, the installation steps are be greatly appreciated.

Also, would like the diagram of how the cams should be set as well. i guess something that will show how the cams and timing marks should be set together.

i would need the installation steps, timing marks and a diagram would also be great appreciated.

Engine Mechanical problem
2002 Jeep Liberty 6 cyl Two Wheel Drive Automatic

i need to know when the cams are lined up at 12 oclock is that straight up or slanted with the heads 12 oclock and also why i wouldnt have any compression on the number 1 cylinder. Before disassembling we had compression just puzzled why we dont now.

Provided pics

Engine is interference was cams or crank turned with chain off?