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Daryl, Shop Owner, Certified Mechanic
Category: Car
Satisfied Customers: 12549
Experience:  28 years experience, Master Mechanic
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how do you change a timing chain on a 1999 Grand Am 3.4L engine.

Customer Question

how do you change a timing chain on a 1999 Grand Am 3.4L engine. with photo's
Submitted: 8 years ago.
Category: Car
Expert:  Daryl replied 8 years ago.


Removal ‘t 1
Disconnect negative battery cable. Drain cooling system. Drain engine oil. Remove front cover Rotate crankshaft until timing marks on crankshaft sprocket and camshaft sprocket are aligned on timing chain damper. See Fig. 7.
2. Remove camshaft sprocket bolt. Remove camshaft sprocket and timing chain. Using Crankshaft Sprocket Puller (J5825-A), remove crankshaft sprocket. Remove timing chain damper bolts and remove damper.
1. Using Crankshaft Sprocket Installer (J-38612), install crankshaft sprocket. Install timing chain damper. Tighten damper bolts to 15 ft. lbs. (20 N.m).
2. Align crankshaft timing mark to timing mark on bottom of chain damper. Hold camshaft sprocket with chain hanging down and install chain onto crankshaft gear. Align timing mark on camshaft gear with timing mark on top of chain damper. See Fig. 7.
3. Install camshaft sprocket bolt. Lubricate chain with engine oil. Install timing chain front cover with NEW gasket. Tighten cover bolts to specification. To install remaining components, reverse removal procedure.



Customer: replied 8 years ago.
I need from start to finish. Starting from how to remove the timing cover and what tools are needed please help
Expert:  Daryl replied 8 years ago.

Below is how to remove the timing cover I believe there are also two bolts from the bottom thought the oil pan not shown in the pic. I do not have a list of tools needed to do this job, I just use what fits.


Removal Timing cover
1. Remove coolant expansion tank. Remove front crankshaft damper. Remove accessory drive belt tensioner. Unbolt power steering pump, and position aside with hoses attached.
2. Remove thermostat by-pass pipe. Disconnect lower radiator hose from water pump. Remove
water pump pulley. Remove upper and lower crankshaft position sensor wiring harness brackets
from front cover. Remove front cover retaining bolts. Remove front cover and gasket. See