Chevrolet Owners Club banner

Crankshaft bolt torque spec?.

19K views 4 replies 2 participants last post by  Aussie Ed  
James, I've so far only found the data for the 3.2 engine which says :-

"Lubricate the threads of the new locking bolt (1) securing the crankshaft pulley with Loctite 272 or equivalent sealant.
Install the crankshaft pulley securing bolt.
Tighten
Tighten the crankshaft pulley locking bolt to 100 N • m (74 lb-ft) and turn the bolt another 150 ° using the angular torque indicator KM-470-B."
 
Important update to my previous post.
I've now found the TIS data for 2.0 l engine.
The 34Nm applies to the four outer small bolts.
The centre sprocket bolt should be 133 Nm

See data below. I hope this helps.


Turn the protrusion of the hex key (a) counterclockwise to tension the belt. Rotate to align the notch point (b).
After aligning with the notch, tighten the timing belt tensioner bolt.
Install the camshaft sprocket bolt.
Tighten

Tighten the timing belt tensioner bolt to 25 N • m (18.4 lb-in).
Tighten the camshaft sprocket bolt to 133 N • m (98.1 lb-in).
Remove the EN-48245 camshaft holder and EN-48246 crankshaft holder.
Turn the crankshaft clockwise for more than 2 cycles and check the mark on the crankshaft sprocket.
After aligning the timing belt, fasten the hole plug bolt for the crankshaft holder.
Tighten
Tighten the hole bolt for the crankshaft holder to 30 N • m (22.1 lb-ft).
Note: If there is no alignment with the TDC point of cylinder No. 1, repeat the above procedure for No. 4 ~ No. 10 until there is alignment."

Installation procedure
Install the engine mount bracket.
Install the timing belt lower cover.
Install the crankshaft pulley.
Install the accessory drive belt tensioning pulley.
Install the timing belt top cover.
Tighten

Tighten the engine mount bracket bolts to 45 N • m (33.1 lb-ft).
Tighten the timing belt lower cover bolts to 11 N • m (97.4 lb-in).
Tighten the crankshaft pulley bolts to 34 N • m (25.1 lb-ft).
Tighten the auxiliary drive belt tensioner bolt to 52 N • m (38.4 lb-ft).
Tighten the timing belt upper cover bolts to 11 N • m (97.4 lb-in)."
 
Hi James, Yes your listing also states 133Nm for the Sprocket bolt torque. I'd go with that.