TIMING BELT — Tensioner/Idler Inspection, Installation, Pretensioning (Supplement-V)

EM-5014prose procedure

"SEEM units" is the proprietary scale of the SEEM belt-tension gauge (KV109B0030) — common on diesel timing-belt installations of this era.

Belt tensioner and idler

IMPORTANT

Confirm that the flywheel, camshaft and injection pump locking pins are still fitted.

1
Loosen the camshaft and injection pump sprocket bolts slightly.
2
Check that the sprockets rotate freely on their hubs.
3
Turn the sprockets in the direction of engine rotation (clockwise) to the end of their slots.
Point arrow on timing belt towards engine rotation (clockwise).
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4
Install timing belt in the following order beginning at the crankshaft over the idler pulley to the injection pump sprocket.
NEM257
5
Turn the injection pump sprocket slightly anti-clockwise to engage the timing belt teeth.
6
Follow the same procedure for the camshaft sprocket.
Angular travel of the sprocket, with respect to the timing belt, must not be greater than one belt tooth.
7
Engage the belt on the tensioner pulley and water pump.

IMPORTANT

Confirm that the flywheel, camshaft and injection pump locking pins are still fitted.

1
Install SST KV109B0030 on the edge of the belt. Take care not to obstruct any other component. Tighten the screw on the tool until a loud click is heard.
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2
Rotate the tensioner counter-clockwise to obtain a reading of: 98 SEEM units for a new belt; 75 SEEM units for a used belt. Tighten the tensioner's nut to the specified torque. Remove SST KV109B0030.

Specification	Value
Pretension target — new beltBelt tension gauge KV109B0030	98SEEM units
Pretension target — used beltBelt tension gauge KV109B0030	75SEEM units
Sprocket-to-belt angular travel limitDuring engagement (step 6)	≤ 1 belt tooth

Pretension target — new beltBelt tension gauge KV109B0030

98SEEM units

Pretension target — used beltBelt tension gauge KV109B0030

75SEEM units

Sprocket-to-belt angular travel limitDuring engagement (step 6)

≤ 1 belt tooth