eveready Posted August 1, 2013 Share Posted August 1, 2013 I have a 93 mack ch 613 350 motor, injection pump is not putting out good pressure on #2 cyl, found one and going to replace pump,. it is a mechanical pump and haven't pulled old one yet. wondering what is the best way to time, the pump?Can I pull the old one and set the gears in same position? Quote Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/ Share on other sites More sharing options...
theakerstwo Posted August 1, 2013 Share Posted August 1, 2013 No you cant. You have to have a yest bench when replacing the plungers on that pump. But what tells you the pressure is weak. I mean how did you check the pressure cause lot of us would like to know that. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197329 Share on other sites More sharing options...
eveready Posted August 1, 2013 Author Share Posted August 1, 2013 cracked the lines loose wasn't getting much squirt out of 2 did not change motor sound either, replaced injectors, and lines from pump already. Quote Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197337 Share on other sites More sharing options...
theakerstwo Posted August 2, 2013 Share Posted August 2, 2013 What I do to test a injection pump but you may not have it but take a old fuel line and injector from a two valve engine and connect to 2 and watch at idle what the injector does then connct to another cyl and compare what the injector sprays.It the spray is less on 2 then pull it.But sounds like your on the proper track. It would be bad to build the pump and then find you have a bad cam in the engine or tight valve. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197373 Share on other sites More sharing options...
eveready Posted August 2, 2013 Author Share Posted August 2, 2013 Replaced Cam about 2 years ago, checked valve lash, Started with a miss and finally got it narrowed down to the pump, never changed one, and haveread they need timed when put in, ordered one will be here in the morning. yea I agee would hate to find out it is something else, 1900.00 for the pump with overnight shipping. Quote Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197389 Share on other sites More sharing options...
theakerstwo Posted August 2, 2013 Share Posted August 2, 2013 Replaced Cam about 2 years ago, checked valve lash, Started with a miss and finally got it narrowed down to the pump, never changed one, and haveread they need timed when put in, ordered one will be here in the morning. yea I agee would hate to find out it is something else, 1900.00 for the pump with overnight shipping.I reread your post and see that you was not intending on replacing the barrels and plungers like I was thinking so yes you have to roll engine over and spot it on the cyl ready to fire and time it when you go back. The way you was asking yes it would run but would not be timed like it needs. If some one don't tell you how then post a pic of pump or tell us the model of pump and some of us can walk you thru it. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197395 Share on other sites More sharing options...
eveready Posted August 2, 2013 Author Share Posted August 2, 2013 would post a pic but cant figure out how, there is one on this site that was for sale that looks identical but numbers a little different,the post title is "Mack/Bosch Mechanical Injection Pump" A unrelated question, I've been told that my truck is an E7 350, When I ordered my pump it listed it for an E6.. How would I be ableto tell the difference,. VIN won't help glider Quote Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197443 Share on other sites More sharing options...
2stacksuperdog Posted August 2, 2013 Share Posted August 2, 2013 You need a E7 pump on a E7 engine Quote Matt Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197444 Share on other sites More sharing options...
2stacksuperdog Posted August 2, 2013 Share Posted August 2, 2013 If the engine has side covers behind the injection pump it is a E6 and if there are no covers its a E7 Quote Matt Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197466 Share on other sites More sharing options...
eveready Posted August 2, 2013 Author Share Posted August 2, 2013 You are correct then it is a E6, interested in the differences between an E6 and a E7 Quote Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197506 Share on other sites More sharing options...
2stacksuperdog Posted August 2, 2013 Share Posted August 2, 2013 E7s have water around the liners, the journals on the crank are bigger and a few other things. Quote Matt Link to comment https://www.bigmacktrucks.com/topic/32159-injection-pump-timing/#findComment-197509 Share on other sites More sharing options...
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