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CATEGORY LISTINGS > CATERPILLAR > C-15 valve and jake adjust specs and procedures [ REFRESH ]
Thread Title:

C-15 valve and jake adjust specs and procedures


Created On Sunday September 07, 2008 06:11 Diesel Talk
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TERMINATOR8
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Posts: 20
Joined: Mar 2008

Note Sunday September 07, 2008 06:11 View thread in raw text format
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I have a 550 hp C-15 with the FASS fuel system installed. Recently the engine has picked up a roughness under load/pull and intermittently will start idling extremely rough and then smooth out again. I'm thinking I have an injector dropping out intermittently. Have been told that these computer controlled engines can compensate too well at times and cover up a problem. Any ideas or info will be helpful. Also I would like to find the valve lash and jake adjustment procedures and specs for this engine. I want to check this out myself but don't have 500$ to spend on a manual. Is there anywhere to get this info?

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jlsj05t2
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desertstormboy
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Joined: May 2008

Note Monday September 15, 2008 20:35 View users profile View thread in raw text format
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is this an older c 15 or the new acert one? Table 2 Valve Lash
Valves Gauge Dimension
Inlet
0.38 mm (0.015 inch)
Exhaust
0.76 mm (0.030 inch)


Adjust the valve lash while the engine is stopped. Use the following procedure in order to adjust the valves:


Put the No. 1 piston at the top center position.
Note: If the engine is equipped with an engine compression brake, loosen the adjusting screw for the lash on the slave piston for the compression brake prior to adjusting the engine valve lash. Refer to the Testing and Adjusting, "Slave Piston Lash - Adjust" topic in order to adjust the slave piston lash.

With No. 1 piston at the top center position of the compression stroke, an adjustment can be made to the valves.
Before any adjustments are made, lightly tap each rocker arm at the top of the adjustment screw. Use a soft mallet to ensure that the lifter roller seats against the camshaft's base circle.


Make an adjustment to the valve lash on the inlet valves for cylinders 1, 2, and 4.

Loosen valve adjustment locknut (3) .

Place the appropriate feeler gauge (5) between the inlet rocker arm and the inlet valve bridge. Turn inlet adjustment screw (4) while valve adjustment locknut (3) is being held from turning. Adjust the valve lash until the correct specification is achieved. Refer to Table 2.

After each adjustment, tighten valve adjustment locknut (3) while valve adjustment screw (4) is being held from turning. Tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Recheck each adjustment.

Make an adjustment to the valve lash on the exhaust valves for cylinders 1, 3, and 5.

Loosen valve adjustment locknut (1) .

Place the appropriate feeler gauge (5) between the exhaust rocker arm and the exhaust valve bridge. Turn exhaust adjustment screw (2) while valve adjustment locknut (1) is being held from turning. Adjust the valve lash until the correct specification is achieved. Refer to Table 2.

After each adjustment, tighten valve adjustment locknut (1) while valve adjustment screw (2) is being held from turning. Tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Recheck each adjustment.

Remove the timing bolt, and turn the flywheel by 360 degrees in the direction of engine rotation. This will position the No. 6 piston at the top center on the compression stroke. Install the timing bolt in the flywheel.

Make an adjustment to the valve lash on the inlet valves 3, 5, and 6.

Loosen valve adjustment locknut (3) .

Place the appropriate feeler gauge (5) between the inlet rocker arm and the inlet valve bridge. Turn inlet adjustment screw (4) while valve adjustment locknut (3) is being held from turning. Adjust the valve lash until the correct specification is achieved. Refer to Table 2.

After each adjustment, tighten valve adjustment locknut (3) while valve adjustment screw (4) is being held from turning. Tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Recheck each adjustment.

Make an adjustment to the valve lash on the exhaust valves 2, 4, and 6.

Loosen valve adjustment locknut (1) .

Place the appropriate feeler gauge (5) between the exhaust rocker arm and the exhaust valve bridge. Turn exhaust adjustment screw (2) while valve adjustment locknut (1) is being held from turning. Adjust the valve lash until the correct specification is achieved. Refer to Table 2.

After each adjustment, tighten valve adjustment locknut (1) while valve adjustment screw (2) is being held from turning. Tighten to a torque of 30 ± 7 N·m (22 ± 5 lb ft). Recheck each adjustment.

Remove the timing bolt from the flywheel after all valve lash adjustments have been made.










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