excavator Posted April 24, 2016 Share Posted April 24, 2016 Hi guys, I have a 1986 Mack RD dump that I just picked up and I am looking at my Mack book on how to adjust the dynatard 4 valve engine. I have no problem following the instructions other than is it required to use the SPECIAL tool as shown in book to loosen the lock nut on the hydraulic side. The tool is not available and I don't believe it is a must have. Book explaind to use special tool to loosen locknut and back out adjuster then using feeler gauge on yoke side adjust the yoke while holding pressure down using .010 feeler. Seems like the tool is not required. I have adjusted many 2 valve mack engines with dynatard cam but this is first 4 valve Quote Link to comment https://www.bigmacktrucks.com/topic/44973-1986-mack-4-valve-and-dynatard/ Share on other sites More sharing options...
blackdog2 Posted April 24, 2016 Share Posted April 24, 2016 The same use a screwdriver !!! Quote Ed Link to comment https://www.bigmacktrucks.com/topic/44973-1986-mack-4-valve-and-dynatard/#findComment-331389 Share on other sites More sharing options...
excavator Posted April 24, 2016 Author Share Posted April 24, 2016 this is the tool book shows to loosen lock nut and back off screw before adjusting yoke adjuster screw Quote Link to comment https://www.bigmacktrucks.com/topic/44973-1986-mack-4-valve-and-dynatard/#findComment-331391 Share on other sites More sharing options...
blackdog2 Posted April 25, 2016 Share Posted April 25, 2016 Never had one of those in my tackle box 11/8 wrench and a two way been doing that way since 1987 ol,'well cant change a old dog.There was a update on the adjusters for the bridges. 1 Quote Ed Link to comment https://www.bigmacktrucks.com/topic/44973-1986-mack-4-valve-and-dynatard/#findComment-331507 Share on other sites More sharing options...
excavator Posted April 25, 2016 Author Share Posted April 25, 2016 sounds like your way worked well all those years and cant ind the SPECIAL wrench any way Quote Link to comment https://www.bigmacktrucks.com/topic/44973-1986-mack-4-valve-and-dynatard/#findComment-331549 Share on other sites More sharing options...
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