krismoriah Posted March 29, 2013 Share Posted March 29, 2013 1988 RD688S E6 350 4V Truck was running great until recently started losing power up the same hill...used to pull it in 4th, now have to pull in 3rd. Same weights same variables. Air filter clean, new fuel filters, no leaks in air to air. Pulled the ends off the turbo, a little play back and forth, kind of hard to spin by hand..but no roughness felt.Since this is a hill issue, is there an aneroid valve in the pump? Should the tubine be easier to spin by hand? I dont have a boost gauge...so yes i need to get one..just trying to rule out the obvious first. Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted March 29, 2013 Share Posted March 29, 2013 There should be an aneroid valve on top of the intake that goes to the puff eliminator. Quote Matt Link to comment Share on other sites More sharing options...
j_martell Posted March 29, 2013 Share Posted March 29, 2013 (edited) Im not a truck mechanic (just a driver),but i have spun alot of wrenches on cars, and in my experience turbos should spin really easy. not saying that is the problem, but i dont think its a good thing. Edited March 29, 2013 by j_martell Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment Share on other sites More sharing options...
felicello122 Posted March 30, 2013 Share Posted March 30, 2013 Turbo should spin easy and smooth. Quote Link to comment Share on other sites More sharing options...
krismoriah Posted March 30, 2013 Author Share Posted March 30, 2013 Compared the spinning to another truck of mine that has a pretty fresh turbo, and there is definately a difference. Will start shopping for a turbo thanks. Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted March 30, 2013 Share Posted March 30, 2013 Dont worry about the spining of the shaft. It will spin when its ready to. One thing you need to check is full throdle. Make sure your gas pedal is massing your lever all the way.That is witrh engine dead, not running. Quote glenn akers Link to comment Share on other sites More sharing options...
krismoriah Posted March 30, 2013 Author Share Posted March 30, 2013 Will have to look for the 'gas pedal' in the truck...lol. I hear ya.. Seriously I had that happen in a 425 cat that we changed fuel filters, air filters, and eventually injector o-rings and fuel lines...finally we decided to look at the linkage and found that there was a rock underneath the 'gas pedal' that was buried in the carpet way under the 'gas pedal'... not the case in this old mack...but will look at the linkage and full travel before buying or shopping for a turbo... Quote Link to comment Share on other sites More sharing options...
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