Skylark L4-138 2.3L DOHC VIN D MFI QUAD 4 (1989)
Timing Chain Housing Fasteners
6. Tighten timing chain housing to block fasteners (48 and 49) to 26 Nm (19 lbs. ft.).
7. Oil/air separator hose to chain housing.
8. Tighten oil pan to timing chain housing bolts to 12 Nm (106 lbs. in.).
9. Chain housing to belt tensioner bracket brace (147). Torque bolt (149) to 26 Nm (19 lbs. in.). Torque bolt (150) to 28 Nm (21 lbs. ft.).
10. Lowest front cover retaining stud into timing chain housing.
11. Lower the vehicle.
12. Tighten timing chain housing to camshaft housing bolts (49) 26 Nm (19 lbs. ft.).
13. Camshaft sprocket(s).
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Sprockets are identical and interchangeable.
14. Camshaft sprocket bolt(s) and washer(s). Tighten to 70 Nm (52 lbs. ft.) while holding sprocket(s) with J 39579 or equivalent camshaft sprocket
wrench. Use Adhesive/Sealant Compound GM P/N 12345493 or equivalent on camshaft sprocket bolt(s).
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Clean old sealant off of the bolt with a wire brush.
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Clean the threaded hole in the camshaft with a M10 x 1.25 tap.
15. Coolant pump assembly to timing chain housing and install nuts hand tight. Lubricate splines with Chassis Grease GM P/N 1051344 or equivalent.
If installing a replacement timing chain housing lube "0" ring with an anti-freeze solution, then slide coolant pump cover over radiator outlet pipe
(Do not damage "0" ring). Install and rotate bolts just enough to close all gaps in this order:
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Cover to pump assembly.
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Cover to block.
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Cover to inlet.
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Tighten bolts/nuts completely to specifications in order:
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Pump assembly to chain housing nuts and torque to 26 Nm (19 lbs. in.)
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Pump cover to pump assembly and torque 14 Nm (124 lbs. in.).
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Cover to block, bottom bolt first and torque to 26 Nm (19 lbs. in.).
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Inlet to cover.
