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Jeep Grand Cherokee WK. Manual - part 1173

7. Install

both

secondary

chains

onto

the

idler

sprocket (2). Align two plated links on the second-
ary 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 ( 1) to hold
chains in place for installation.

8. Align primary chain double plated links with the tim-

ing 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.

9. 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.

10. Install all chains, crankshaft sprocket, and idler

sprocket as an assembly. After guiding both sec-
ondary chains through the block and cylinder
head openings, affix chains with a elastic strap or
equivalent. This will maintain tension on chains to
aid in installation. Align the timing mark (2) on the
idler sprocket gear (3) to the timing mark on the
counterbalance shaft drive gear (1), then seat
idler sprocket fully. Before installing idler sprocket
bolt, lubricate washer with oil, and tighten idler
sprocket assembly retaining bolt to 34 N·m (25 ft.
lbs.).

NOTE: It will be necessary to slightly rotate cam-
shafts for sprocket installation.

11. Align left camshaft sprocket “L” dot to plated link

on chain.

12. 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 over-
torque of bolt resulting in bolt failure.

13. 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.

14. 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.

15. Install both secondary chain tensioners. Tighten bolts to 28 N·m (250 in. lbs.).

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

16. Remove all locking pins (3) from tensioners.

9 - 1288

ENGINE - 3.7L SERVICE INFORMATION

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.

17. Using Special Tool 6958, Spanner with Adaptor

Pins 8346 (4) , tighten left. camshaft sprocket
bolts to 122 N·m (90 ft. lbs.).

18. Using Special Tool 6958, Spanner with Adaptor

Pins 8346 (2) , tighten right camshaft sprocket
bolts to 122 N·m (90 ft. lbs.).

19. Rotate engine two full revolutions. Verify timing

marks are at the follow locations:

•

primary chain idler sprocket dot is at 12 o’clock

•

primary chain crankshaft sprocket dot is at 6
o’clock

•

secondary chain camshaft sprockets “V6” marks
are at 12 o’clock

•

counterbalancer shaft drive gear dot is aligned to
the idler sprocket gear dot

20. Lubricate all three chains with engine oil.

ENGINE - 3.7L SERVICE INFORMATION

9 - 1289

21. After installing all chains, it is recommended that

the idler gear end play be checked. The end play
must be within 0.10 -0.25 mm (0.004 - 0.010 in.).
If not within specification, the idler gear ( 1) must
be replaced.

22. Install timing chain cover and crankshaft damper

(Refer to 9 - ENGINE/VALVE TIMING/TIMING
BELT / CHAIN COVER(S) - INSTALLATION) and
(Refer to 9 - ENGINE/ENGINE BLOCK/VIBRA-
TION DAMPER - INSTALLATION).

23. Install cylinder head covers (Refer to 9 - ENGINE/

CYLINDER HEAD/CYLINDER HEAD COVER(S) -
INSTALLATION).

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

24. Coat the large threaded access plug (2) with

Mopar

Thread Sealant with Teflon, then install

into the right cylinder head and tighten to 81 N·m
(60 ft. lbs.).

25. Install the oil fill housing.

26. Install access plug (1) in left cylinder head.

27. Install power steering pump (Refer to 19 -

STEERING/PUMP - INSTALLATION).

28. Fill cooling system (Refer to 7 - COOLING -