Adjusting Screws

Our rocker arm screws are made of a hot working tool steel that goes through a 4 stage heat treating process before it gets a specialty surface treatment to improve its wear resistance. This combination of materials and heat treat procedures makes the most durable and reliable screws available anywhere. All of our tool steel screws are manufactured with rolled threads and broached to accept an allen wrench. The screws are available with or without oil holes for pre-lube and oil grooves for pressure feed oiling. Manton makes custom screws on request, minimum quantities may apply. Depending on the style of screw and the application proper installation instructions will vary from one style screw to the next. Pressure fed adjusting screws need the oil band positioned properly so oil can flow around the oil band and into the side oil hole of the screw. 

Rocker arm adjusting screws that are not pressure fed that have a ball on them are usually positioned with 2 to 3 threads sticking out the bottom of the rocker. Adjusting screws with a cup on them are usually backed up into the rocker arm all the way first then screwed 1 to 1 1/2 turns out. These instructions may vary a little from one application to the next so it may be a good idea to call us or the rocker arm manufacturer for more specific details. 

Pre-lubrication of these screws before use is very important. It is recommended that a high zinc content assembly lube oil be used to prevent galling on the initial start-up. DO NOT use anti seize of any kind on pushrod tips and adjusting screws. Anti seize contains soft metal particles that turn into and abrasive at high temperature and doesn’t allow the engine oil to coat the friction points properly.