GASKET 1W1039 - Caterpillar

Introduction
Use this procedure for adjusting the Hydraulic Lash Adjusters (HLAs) on C175 diesel engines.During service, oil is not supplied to the HLA low-pressure chamber. Therefore, events such as excessive barring, multiple HLA adjustments, and removing / reinstalling rocker mechanisms (without backing off adjusting screw), may cause the HLA to bleed off oil.If this occurs, the HLA will not be able to refill the high-pressure chamber, therefore the HLA will feel soft during adjustments. Refer to the following Testing and Adjusting procedure to refill the HLA and readjust. If the HLA is not refilled prior to start-up, the HLA will take longer to fill due to air entrainment. Therefore, you will hear valve train noise for a longer period of time as the HLA refills.Required Tools
Table 1
Required Tools Qty
386-3239 Wrench 1
458-3600 Torque Wrench 1
494-5411 Disposable Syringe 1
494-5412 Reusable Probe 1
494-5414 Valve Depressing Tool 1
Clean Engine Oil Valve Lash Adjust Preparation
Ensure that the number 1 piston is at the top center position. Refer to Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston".
The number 1 piston must be at the top center position of the correct stroke. Adjust the valves according to the chart: Refer to Testing and Adjusting, "Crankshaft Positions for Fuel Injector Adjustment and Valve Lash Setting".Note: Keep all parts clean from contaminants. Contaminants may cause rapid wear and shortened component life.
Remove the valve covers. Refer to Disassembly and Assembly, "Valve Cover – Remove and Install".
Illustration 1 g03896611
(1) Rocker bolt
(2) Rocker shaft
Remove rocker shaft bolts (1) from the rocker arm base.
Remove rocker shaft assembly (2) from the rocker arm base.
Illustration 2 g03896612
(3) Hydraulic lash adjuster
(4) Lifter
Remove HLAs (3) from the cup of valve lifters (4).Valve Lash Check and Adjust
Illustration 3 g03896613
(5) Adjusting screw nut
(6) Adjusting screw
Loosen valve adjusting screw nuts (5).
Loosen adjusting screw (6) until push ball end contacts rocker arm.Note: This action is a best practice and acts as a reminder the HLA needs set each time.
There are six steps to ensure that the HLA is properly filled with oil:
Compression test
Oil fill
Valve depressing tool
Repeat compression test
Repeat oil fill
Keep HLA vertical
Illustration 4 g03890206
Depress the top of the HLA, refer to Illustration 4. If the resistance is "spongy" go to Step 5. If the HLA is "solid" go to Step 9.
Illustration 5 g03890207
(A) 494-5411 Disposable Syringe
(B) 494-5412 Reusable Probe
Illustration 6 g03890208
(A) 494-5411 Disposable Syringe
(B) 494-5412 Reusable Probe
Fill the HLA inside the piston with clean engine oil using the disposable syringe (A) and reusable probe (B) until full and oil accumulates in the cup. Refer to Illustration 6.
Illustration 7 g03890210
(C) 494-5414 Valve Depressing Tool
Insert the valve depressing tool (C) into cup of the HLA. Refer to Illustration 7.
Illustration 8 g03890211
(C) 494-5414 Valve Depressing Tool