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Product: PETROLEUM ENGINE

Model: C175-16 PETROLEUM ENGINE P6L00127
Configuration: C175–16 Petroleum Engine P6L00001-UP

Special Instruction
Procedure to Measure Valve Recession for C175 Engines {0759, 0760, 1100, 1105}
Media Number -M0081144-03 Publication Date -20/09/2017 Date Updated -20/09/2017

i07177672

Procedure to Measure Valve Recession for C175 Engines {0759, 0760,

1100, 1105}
SMCS - 0759; 0760; 1100; 1105

Electric Power Generation

C175-16 GEN SET (S/N: WYB1-UP)
Engine
C175-16 (S/N: 3A91-UP; M6A1-UP; Y3A1-UP; M6B1-UP; R3B1-UP; WYC1-UP; P6L1-UP; KWT1-
UP; R1X1-UP; J4Y1-UP)
C175-20 (S/N: R4F1-UP; BXR1-UP)
Off-Highway Truck/Tractor
793F (S/N: SND1-UP; SSP1-UP; SXP1-UP; D3T1-UP; RBT1-UP)
793F AC (S/N: EMD1-UP)
794 AC (S/N: MN51-UP; MT51-UP)
795F AC (S/N: ERM1-UP)
795FAC XQ (S/N: SNT1-UP)
797F (S/N: LAJ1-UP; WSP1-UP)

Introduction
Do not perform any procedure in this Special Instruction until you have read the information and you understand the
information.

This special instruction will provide the needed tooling and procedure to take valve recession measurements on a
C175 engine without removing the valve mechanism components.

The depth indicator can be assembled using the components called out in this instruction, or purchased as a set. The
indicator should be able to measure between 90 mm to 105 mm. The tip of the indicator must be small enough to fit
through the bridge oil passage (2mm).

All dimensions are in mm and should be measured and recorded in mm.

For consistent readings, always measure stem projection with the cylinder heads torqued to the engine.

Required Parts
Table 1

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Part Number Part Description Qty

3C-3364 Half Nut 3
3P-1565 Clamp 1
5P-4156 Indicator Base 1
8T-4224 Hard Washer 3
9X-6000 Bolt 3
369-2607 Dial Indicator 1

Starret® PT06632-14 or equivalent Indicator Special Contact Point 1

Starret PT21697-2 or equivalent Drop Indicator Extension 1

FT3339 FT drawing of stand 1

Illustration 1 g06178343
Stand Assembly
(1) 9X-6000 Bolt
(2) 8T-4224 Hard Washer
(3) 3C-3364 Half Nut

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1. For the FT3339 print, go to https://dealer.cat.com/en/ps/service-tools.html.

2. Click the "FT Prints" tab.

3. Click the "FT3300 - FT3399" tab.

4. Click "FT3339" tab.

Illustration 2 g06178345
Depth Indicator Assembly
(4) 369-2607 Dial Indicator
(5) 3P-1565 Clamp
(6) 5P-4156 Indicator Base
(7) PT21697-2 Drop Indicator Extension
(8) PT06632-14 Indicator Special Contact Point

Procedure
1. Allow the engine to cool until the valve mechanism is approaching room temperature.

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2. Remove the valve cover.

3. Place stand on head and tighten three bolts to "hand tight".

Illustration 3 g06178352
(1) Zero hole/tube

4. Place depth indicator firmly onto stand plate in "Zero" hole/tube.

Illustration 4 g06178353

5. Run down indicator until the indicator touches. Zero the indicator by pressing "SET" button on the indicator.
Spring pressure provides consistent contact on the master surface.

6. Place the depth indicator into the Intake Inboard (II) slot and run the depth indicator tip through the bridge oil
hole and ensure that the tip does not touch the side walls of the 2 mm hole.

7. Run the probe down until the probe makes solid contact with the top of the valve, while holding the depth
indicator firm to the stand plate.

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8. Record the measurement on the check sheet provided at the end of this document.

9. Repeat Steps 6 through 8 for the Intake Outboard (IO) and Exhaust Outboard (EO).

Note: Do not measure the Exhaust Inboard (EI).

10. Remove stand bolts and repeat Steps 1, 2, 6 through 8 for the remaining cylinder heads

11. At the same time, while doing projection measurements, the valve lash (intake and exhaust) should be
measured/documented and adjusted as needed.

12. Record and store measurements.

Measurement Interpretation
The first measurement is usually 0.0 mm to +0.4 mm

• The first measurement should be taken in the first 250 hours.

• If the first measurement is taken within the first 4000 hours, the measurement will still be usable to track
valve recession over time

Future measurements will typically be less than the original, as the valve moves upward over time.

Future measurement limit: -0.4 mm to 0.0 mm

• If the current measurement is -0.4 mm or less than the previous measurement, this head should be monitored
closely for valve recession.

• If future measurements continue to show a similar linear increase, the head should be planned to be replaced
as the measurements approach 2 mm, do not let the measurement reach 2 mm before scheduling the head for
replacement.

A spreadsheet that performs the recession calculations can be obtained by entering a Dealer Solution Network
(DSN) ticket or contacting a Lafayette service engineer.

Valve Recession Sample Calculation

Table 2
250 500 1K 2K 3K
0 hr Recession Recession Recession Recession Recession
hr hr hr hr hr
- - - -
Cyl Inboard 0.22 0.1 0.12
0.1
0.32
0.2
0.42
0.3
0.52
0.4
0.62
#1
Outboard 0 0 0 0 0

In this example, the 0-hour measurement was 0.22 mm, at 250 hours the measurement was 0.1 mm, so this valve
had recessed 0.12 mm.

At the 500-hour measurement, the indicator measured -0.1 mm, which equates to 0.32 mm of recession vs. the 0.22
mm that was measured at 0 hours (0.22 mm minus -0.1 mm = 0.32 mm).

At the 1000-hour measurement, the indicator measured -0.2 mm, which equates to 0.42 mm of recession vs. the 0.22
mm that was measured at 0 hours (0.22 mm minus -0.2 mm = 0.42 mm).

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Check Sheets
C175-16

Table 3
WMC R/O Date
Equipment # Equipment HRS
Engine S/N Engine HRS
Intake Intake Exhaust Exhaust
Cylinder
Cat Spec. 0.031 Inboard Outboard Outboard Cat Spec. 0.051
#1 Comp Comp
#2 Comp Comp
#3 Comp Exh
#4 Comp Exh
#5 Comp Comp
#6 Exh Comp
#7 Comp Exh
#8 Comp Comp
#9 Exh Comp
# 10 Exh Exh
# 11 Exh Exh
# 12 Comp Exh
# 13 Exh Comp
# 14 Exh Comp
# 15 Exh Exh
# 16 Exh Exh
Standard Rotation (Counterclockwise) As Viewed From Flywheel End
Cylinders To Check/Adjust
Correct Stroke For
Engine Inlet Valves Exhaust Valves
No. 1 Piston (TDC)
Compression 1–2–3–4–5–7–8–12 1–2–5–6–8–9–13–14
C175-16
Exhaust 6–9–10–11–13–14–15–16 3–4–7–10–11–12–15–16
PUT THE NO.1 PISTON AT TOP CENTER (TC) POSITION AND IDENTIFY THE CORRECT STROKE.
MAKE REFERENCE TO TESTING AND ADJUSTING, FINDING TOP CENTER POSITION FOR NO.1
POSITION.

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FIND THE TOP CENTER POSITION FOR A PARTICULAR STROKE AND MAKE ADJUSTMENT FOR
THE CORRECT CYLINDER.

C175-20

Table 4
WMC R/O Date
Equipment # Equipment HRS
Engine S/N Engine HRS
Intake Intake Exhaust Exhaust
Cylinder
Cat Spec. 0.031 Inboard Outboard Outboard Cat Spec. 0.051
#1 Comp Comp
#2 Comp Comp
#3 Comp Exh
#4 Comp Exh
#5 Comp Comp
#6 Exh Comp
#7 Comp Exh
#8 Comp Comp
#9 Exh Comp
# 10 Exh Exh
# 11 Exh Exh
# 12 Comp Exh
# 13 Exh Comp
# 14 Exh Comp
# 15 Exh Exh
# 16 Exh Exh
# 17 Comp Exh
# 18 Comp Exh
# 19 Exh Exh
# 20 Exh Exh
Standard Rotation (Counterclockwise) As Viewed From Flywheel End
Cylinders To Check/Adjust
Engine Correct Stroke For Inlet Valves Exhaust Valves

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No. 1 Piston (TDC)

Compression 1–2–5–6–10–11–13–14–17–18 1–2–3–4–11–12–13–14–15–16
C175-20
Exhaust 3–4–7–8–9–12–15–16–19–20 5–6–7–8–9–10–17–18–19–20
PUT THE NO.1 PISTON AT TOP CENTER (TC) POSITION AND IDENTIFY THE CORRECT STROKE.
MAKE REFERENCE TO TESTING AND ADJUSTING, FINDING TOP CENTER POSITION FOR NO.1
POSITION.
FIND THE TOP CENTER POSITION FOR A PARTICULAR STROKE AND MAKE ADJUSTMENT FOR
THE CORRECT CYLINDER.

Copyright 1993 - 2019 Caterpillar Inc. Fri Aug 16 11:40:37 UTC-0400 2019
All Rights Reserved.
Private Network For SIS Licensees.

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