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 Daniel Wilson Your Own Question
Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 5316
Experience:  Owner at DJ Wilson
Type Your Medium and Heavy Trucks Question Here...
Daniel Wilson is online now
A new question is answered every 9 seconds

I have a 1998 mack e7 engine that after i set valve lash and

Customer Question

i have a 1998 mack e7 engine that after i set valve lash and i rotate engine i have excessive valve lash on the intake valves. engine has always had a clatter. just replaced the cam/cam gear and cam followers. cam followers failed at 750000 miles.not sure if this is inherent noise in this engine. been through adjustment twice always end uo the same
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 1 year ago.

Hi Phil, my name is***** the cam gear timing and that the correct cam is installed in the engine and they didnt sell you the wrong part number. Let me know

Customer: replied 1 year ago.
Dont think cam is the problem.Numbers match and timing marks were dead on. Again this has been an ongoing issue for 500000 miles or more. just want to know if this is an ongoing problem with this model engine. Been working on heavy duty diesel engines since 1977 and have never had this issue. Was really looking for a mack tech to answer my questions so i dont waste anybody time
Expert:  Daniel Wilson replied 1 year ago.

What is the full model number from the engine tag. If yours has the dynatard and the spring loaded pushrod then click this link for the adjustment procedure and operation. There will be some slack on this style but you need to compress the pushrod spring to adjust as mentioned in the link below. Let me know the model so I can be sure to post the correct procedure. How many valve? 12 or 24? Model?


Expert:  Daniel Wilson replied 1 year ago.

Hi Phil, Did you get this resolved?

Related Medium and Heavy Trucks Questions