TownsendMack Posted December 31, 2022 Share Posted December 31, 2022 (edited) In front of the fuel pump, passenger side, on base of block, behind radiator fan, is a hole..that spins with engine running...obvious oil weep coming from the area. What goes here? Recently bought Mack truck for a workhorse. Trying to make sure she runs, and continues too. Edited December 31, 2022 by TownsendMack Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/ Share on other sites More sharing options...
mowerman Posted December 31, 2022 Share Posted December 31, 2022 Not sure I can go take a look at mine a little later, but I’m sure somebody will answer your question, before that good luck great choice bob Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519394 Share on other sites More sharing options...
Freightrain Posted December 31, 2022 Share Posted December 31, 2022 Tach drive. I aasume the tach on the dash does not work. What is the black tube hanging in the front of the picture? Looks like a tach cable. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519413 Share on other sites More sharing options...
TownsendMack Posted December 31, 2022 Author Share Posted December 31, 2022 Appreciate the responses. I'll take a look at tach situation...should have thought of that. How is it supposed to attach? It looks sheared? Any issue getting dirt in there if left removed? Usually shift with a bit of finesse and the ears anyways... Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519416 Share on other sites More sharing options...
Joey Mack Posted December 31, 2022 Share Posted December 31, 2022 They are just like a speedo drive on an older car or truck. push in and tighten the large knurled knob to hold it in place.. the end of the tach cable should have a keyed end that fits in the hole. it may be a square end and you put the correct plastic tip on it.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519421 Share on other sites More sharing options...
mowerman Posted December 31, 2022 Share Posted December 31, 2022 According to the photo, it does look like something is sheared off .Bob Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519422 Share on other sites More sharing options...
Freightrain Posted December 31, 2022 Share Posted December 31, 2022 Zooming in you can see the notch for the tab on the cable. Likley the cable broke and was just taken off? 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519424 Share on other sites More sharing options...
TownsendMack Posted December 31, 2022 Author Share Posted December 31, 2022 Hard to say, there are a few gremlins to work out. The speedo connection is flush with the block, so I believe it must have sheared/broke durings its life. Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519427 Share on other sites More sharing options...
Joey Mack Posted December 31, 2022 Share Posted December 31, 2022 The drive end that is in the block looks good.. the cable is what needs to be checked.. Is that the old cable in the picture? it comes from the back of the tach, through the firewall, and around the engine to that drive hub that you see.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519428 Share on other sites More sharing options...
TownsendMack Posted December 31, 2022 Author Share Posted December 31, 2022 I'll have to look. Truck is offsite today. My assumption is yes, but will veryify the end of the cable when I get a chance. Appreciate the input greatly. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519430 Share on other sites More sharing options...
Joey Mack Posted December 31, 2022 Share Posted December 31, 2022 All good... Catch you later.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519431 Share on other sites More sharing options...
Freightrain Posted December 31, 2022 Share Posted December 31, 2022 Hard to see the picture. Maybe the nut is there but the sleeve was broken off. Should be able to unscrew the threaded nut easy enough. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70944-r688st-1986-mack-10-spd-e6-350-engine/#findComment-519433 Share on other sites More sharing options...
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