How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask catmastertech Your Own Question

catmastertech
catmastertech, Technician
Category: Heavy Equipment
Satisfied Customers: 1894
Experience:  19 years Cat, 3 years Case
11546476
Type Your Heavy Equipment Question Here...
catmastertech is online now
A new question is answered every 9 seconds

what are the overhead settings on a CAT c15 acert intake,

Resolved Question:

what are the overhead settings on a CAT c15 acert? intake, valves injectors, variable vale actuators?
Submitted: 4 years ago.
Category: Heavy Equipment
Expert:  catmastertech replied 4 years ago.
Valve Lash
Valves Acceptable Range for Valve Lash
Inlet
0.38 ± 0.08 mm (0.015 ± 0.003 inch)
Exhaust
0.76 ± .08 mm (0.030 ± 0.003 inch)

The following procedure should be followed when variable valve actuators (20 have been removed from the engine.
graphic

Loosen jam nut (1) .


--------------------------------------------------------------------------------

NOTICE
Do not turn the cylinders clockwise. If you turn the cylinders clockwise, the piston assembly will fall out of the housing. If the piston assembly falls out of the housing, damage to the piston will occur.


--------------------------------------------------------------------------------



Turn the cylinders (2) counterclockwise until the cylinders reach the stop.
Note: Do not force the cylinders. Damage will occur to the cylinders.


Install the variable valve actuators onto the cylinder head. Refer to the Specifications manual for the proper torque sequence.

Set cylinder 1 at the top center position. See Testing and Adjusting, "Finding Top Center Position for the No. 1 Piston" for details on this procedure.
Note: The inlet valves should be fully closed. The rocker arm should rest on the base circle of the camshaft lobe.


Set lash (3) on the following cylinders: 1, 2 and 4. Refer to Specifications, "Variable Valve Actuators" for the amount of lash.

Place the feeler gauge between the piston pin and the rocker arm.
Note: The inlet rocker arm must be in contact with valve bridge (4) when you set the lash for variable valve actuators.


Turn the cylinder clockwise until the feeler gauge fits snugly between the piston and the rocker arm.

Tighten jam nut (1). Refer to Specifications, "Variable Valve Actuators" for the proper torque for the jam nut.

Turn the crankshaft clockwise by 360 degrees. This will position the No. 6 piston at the top center on the compression stroke. Install the timing bolt in the flywheel.

Repeat Step 5 for the following cylinders: 3, 5 and 6.

Connect the proper wiring harness to each solenoid.

 

Electronic Unit Injector - Adjust

Table 1 Required Tools
Part Number Part Name Quantity
9U-7227 Injector Height Gauge 1


Note: Determine the style of variable valve actuator that is installed on the engine. For the BXS engines, remove the variable valve actuators. For the MXS engines, it is not necessary to remove the variable valve actuators.
--------------------------------------------------------------------------------

graphic


--------------------------------------------------------------------------------

Injector Mechanism

(1) Rocker arm

(2) Adjustment screw

(3) Locknut

(4) 9U-7227 Injector Height Gauge



To make an adjustment to the unit injectors on cylinders 3, 5, and 6 use the following procedure:


Put the No. 1 piston at the top center position on the compression stroke. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".

Injector height gauge (4) is used in order to obtain a dimension of 78.0 ± 0.2 mm (3.07 ± 0.01 inch). The dimension is measured from the top of the unit injector to the machined ledge of the fuel injector body.

Turn unit injector adjustment screw (2) clockwise until the correct height is obtained.

Hold the adjustment screw in this position and tighten locknut (3) to a torque of 100 ± 10 N·m (74 ± 7 lb ft).

To make an adjustment to the unit injectors on cylinders 1, 2, and 4, remove the timing bolt. Turn the flywheel by 360 degrees in the direction of engine rotation. The direction of engine rotation is counterclockwise, as the engine is viewed from the flywheel end. This will put the number 1 piston at the top center position on the exhaust stroke.

Repeat Steps 3 through 4.

Remove the timing bolt from the flywheel after all the unit injector adjustments have been made. Reinstall the valve mechanism cover.


Customer: replied 4 years ago.
i know the procedure. I Have the inj. height tool. what i need to know is the lash for the variable valve actuators. the tag on the oil cooler is gone. the engine ser no. is BSX18151
Expert:  catmastertech replied 4 years ago.
Torque for adjustment locknut ... 50 ± 10 N·m (37 ± 7 lb ft)

Lash for the variable valve actuators ... 0.50 ± 0.08 mm (0.020 ± 0.003 inch)

Note: The inlet rocker arm must be in contact with valve bridge (4) when you set the lash for the variable valve actuators.
catmastertech, Technician
Category: Heavy Equipment
Satisfied Customers: 1894
Experience: 19 years Cat, 3 years Case
catmastertech and other Heavy Equipment Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka - Moose)

    Technician

    Satisfied Customers:

    112
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka - Moose)'s Avatar

    Chris (aka - Moose)

    Technician

    Satisfied Customers:

    112
    16 years of experience
  • http://ww2.justanswer.com/uploads/Boxerman1969/2009-06-22_213107_ja_avatar.JPG Tim's Avatar

    Tim

    Foreman

    Satisfied Customers:

    338
    23 Years Heavy Equipment and Truck Repairs Shop and Field in the Minning and Construction Industry
  • http://ww2.justanswer.com/uploads/jrwhitey2000/2009-01-03_193237_me.jpg J.R.'s Avatar

    J.R.

    Technician

    Satisfied Customers:

    148
    13 years as warranty technician for Detroit Diesel
  • http://ww2.justanswer.com/uploads/yellowman99/2010-03-20_033822_Marshall_Pete_Furr.jpg Cat Man's Avatar

    Cat Man

    Caterpillar Engine Expert

    Satisfied Customers:

    3706
    23 Years Caterpillar Engine experience.
  • http://ww2.justanswer.com/uploads/WT/wtolkson/2012-6-8_12723_JApicture2012.64x64.jpg Wayne's Avatar

    Wayne

    Journeyman

    Satisfied Customers:

    3017
    34 years experiance as engine rebuild and problems.Thermo-King repair and trouble shooting.
  • http://ww2.justanswer.com/uploads/cumminsdr/2010-7-20_204410_ja.jpg DR.Cummins's Avatar

    DR.Cummins

    FIELD SERVICE TECHNICIAN

    Satisfied Customers:

    2352
    16 Years working on Cummins Diesel engines,
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    service manager

    Satisfied Customers:

    2226
    30 years exp. with diesel engines, heavy equipment and forklifts, including lp forklifts