Now what is valve lash? Remember there is no ignition on a diesel engine, and it runs on high compression, the valves, intake and exhaust open and close by the turning of the camshaft. The lobe of the cam pushes up on the rocker arm that pushes down on the valve tappet causing the valve to open. The lash is the carefully measured space between the rocker arm and the valve tappet. Too little space and the valve will not completely close and too much causes noise and excess load on the valves and valve train components. It causes the valve to slam open and close instead of riding the cam lobe smoothly. You can read more about it here if you'd like.
So we set up our appointment with the caveat that the total cost of the job would be determined by how tough it was to access the engine and work on it, a lot more challenging in a motorhome than a truck! And most of the service places really don't like working on coaches:) We were quoted between $550- $900 for the job. We were confident ours would be quite accessible as our manufacturer did a relatively good job of providing real access to the the engine.
We arrived at the Detroit Diesel service center Sunday afternoon and backed up to our assigned bay door.
|Camp Detroit Diesel!|
Right at 7:30, we met our tech, Steve also, and he remarked that it looked like it would be easier than he anticipated, good news.
|All ready for Steve|
|The valve cover|
|Valve cover popped off|
|The top of the valves and the two Jake brakes|
|One of the Jake brakes lying on the floor|
|Now you can see the rocker arms in the middle and the top of the valves|
along the right side. The camshaft runs along the left side.
|Steve has reattached one Jake Brake so far and is|
torquing the bolts