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  1. I’m running the red coolant in my 96 RD and just changed the coolant filter with a Mack brand. Is this ok? I read where somebody said Mack filter is only to be used with green coolant. Should I change back to non Mack filter?
  2. 96 RD690 has no brake lights, turning signal on passenger side rear. Front signals work. No apparent broken wires. Fuses looked ok. Anybody have any ideas?
  3. I just went through this on a 96 em7-300 fully mechanical. Threw a bunch of parts at it including new lift pump and fuel lines etc. It ended up being the little jumper between the heads for the return fuel. One of the fittings was a little loose. Problem solved
  4. Still having an Issue with full mechanical E7 fuel prime bleeding down over night and causing long crank times. Have replaced fuel return line and also lift pump no luck. Truck idles nice but seems to have a slight miss operating. Somebody earlier mentioned a possible bad injector. Would one bad injector cause long crank times? Also somebody mentioned a possible bad check valve. Where is this valve located?
  5. I’m thinking it always happens when pulling a load up a hill and the fan kicks on ? I was reading about a possible bad belt tensioner also maybe?
  6. 96 E7 all mechanical. Going through the gears and when hitting roughly 1600 rpm the engine has obnoxious squealing noise. Its coming from the front of engine but I don’t think it’s the belts. What else could cause this noise?
  7. Replaced both plastic return lines coming from front of head and also the smaller one that comes off the same fitting on back of injection pump. Problem solved
  8. Ok. How about those air valves that are on the top driver side of transmission in the back with the air lines going into them. Should those be replaced while it’s out?
  9. Picked up a 12 speed from a salvage yard today that was said to have low miles but who knows. I planned on replacing all of the air lines just because they are old. What else needs to be checked or should be replaced before putting it into the truck? Trying to avoid having to pull it back out to repair or replace something that should have been checked when it was out.
  10. Ok I will check filter housings and put a new lift pump on it and see if that does it. Thank you for the replies.
  11. Have a 96 E7 all mechanical with Bosch pump. When the truck is running it runs and idles great. Turn it off and it will start the next day. Let it sit for a few days and it will not start without cranking the piss out of it. Do not see any obvious leaks in the fuel lines. Something is causing it to lose prime. Which parts should I replace first any ideas? What causes is to lose prime?
  12. Hello all I have a Q regarding a lift pump on a Robert Bosch all mechanical pump on an E7. I took lift pump off to change out a cracked elbow on inlet line and noticed that the plunger on lift pump moves in and out but has no resistance on it. Shouldn’t this plunger push back out by itself after you push it in? I just purchased a new Bosch lift pump for a Deere excavator and its very similar and it pops back out when you push the plunger in. Is there a spring in there hat could be damaged?
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