Time for Some Tech Talk!

June 30, 2014 7:17am

Hey there! I’m Mickey Williams, the Service Manager here at Stribling Equipment. I’ve been with this company for 41 years, so I’ve seen just about every type of service issue come through my doors. We’re happy to handle any service-related situation, whether it’s preventative maintenance or reactive attention. We’re always looking out for our customers, though, which is why I’d like to talk to you about how you can prolong the life of your engine.

Do you know the one thing that is absolutely essential for long engine life, ideal engine performance and optimized fuel economy? It’s engine valve lash adjustment. As it turns out, your John Deere engine is equipped with a solid lifter valve train system. You guessed it – that’s a great thing! But unlike hydraulic lifters, valve train systems must be adjusted periodically. Contact, load and motion are required for wear to develop, and if all three of those things happen in excess, you could be in trouble. The valve train for a typical four-stroke engine has potential for wear at five contact points which always have motion and load:

  • Between the camshaft lobe to lifter
  • Between the Lifter and push rod bottom
  • Between the push rod top and the rocker arm
  • Between the rocker arm and the valve stem
  • Between the valve face and the valve seat

There are even more places to watch for wear if the engine has multiple valves. As these contact points wear, they begin to slap, and as clearance increases over time, the slap becomes very aggressive. As a result, wear is accelerated and multiplied. To make matters worse, just add dirty oil to the recipe. Dirty oil complicates the situation because contamination limits lubrication protection and consequently allows contact. Dare I say it’s a slippery slope?

But don’t worry – there’s something you can do. The very first valve adjustment is the most critical, as the valves have seated. This area isn’t lubricated and is subjected to the heat of combustion – especially the exhaust valves. If ignored, this can lead to a catastrophic engine failure such as a dropped valve. So you really need to take preventative action!

Keep your engine performing at its best by adjusting the valve lash as prescribed by the manufacturer. That’s where we come in. Make valve adjustments a part of your preventive maintenance program. You will be glad you did.

Don’t allow your engine to self-destruct! Be pro-active and call us to schedule a service appointment today.