zumogo Posted July 25, 2019 Share Posted July 25, 2019 I'm looking into buying a 95 Mack Rd with a EM7 300hp engine. The engine has some problem. I'm sharing a link of the noise. If someone can identify the problem I really appreciate it. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/ Share on other sites More sharing options...
alex g Posted July 25, 2019 Share Posted July 25, 2019 It sounds like it's not running on all cylinders. It could be a bad injector. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428702 Share on other sites More sharing options...
zumogo Posted July 25, 2019 Author Share Posted July 25, 2019 Thank you Alex. My mechanic said worse case it could be the injection pump. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428704 Share on other sites More sharing options...
fjh Posted July 25, 2019 Share Posted July 25, 2019 (edited) If you can determine which cylinder is causing the issue these pumps have a track record For the delivery valve washers cracking Its a simple fix if you have the right socket to remove the delivery valve! If you have a fuel shop near you? you could stop by and have em check this! Edited July 25, 2019 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428714 Share on other sites More sharing options...
Mack Technician Posted July 25, 2019 Share Posted July 25, 2019 Unless I had a spare engine at home, and got a greatly reduced price, I'd work out a deal to hear all 6 cylinders working before purchase. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428716 Share on other sites More sharing options...
zumogo Posted July 25, 2019 Author Share Posted July 25, 2019 Thank you Mack tech. I mean they don't want to go any lower. Even when I pointed out the noise. It will probably end up in a boat to Africa if I don't buy it. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428726 Share on other sites More sharing options...
zumogo Posted July 26, 2019 Author Share Posted July 26, 2019 How are the 2000 Mack Rd with e7 350hp engine? This one on truck paper says It has no Jake brake, which is weird. I'll call them tomorrow Thank you for your opinion. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428755 Share on other sites More sharing options...
JoeH Posted July 26, 2019 Share Posted July 26, 2019 It'll probably have a right side computer, which people say you have to be very careful with. Its close to the frame and if the engine torques too much from worn out engine mount bushings all it takes is a tiny dent in the housing and the ECU is shot. Personally I like the 2001 etech engines, but I only had limited experience owning one for a year or so. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428758 Share on other sites More sharing options...
Mack Technician Posted July 26, 2019 Share Posted July 26, 2019 (edited) Solid chassis, Good engine (relative to maintained condition). E-Tech can make 350 horses with one piston tied behind its back. Easy day, low horsepower expectation= long life. Edited July 26, 2019 by Mack Technician 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428759 Share on other sites More sharing options...
zumogo Posted July 26, 2019 Author Share Posted July 26, 2019 Now on the 2000 Mack, salesman said the only bad is the frame rails is flaked bad. No cracks just flaked between the double frame. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428828 Share on other sites More sharing options...
JoeH Posted July 26, 2019 Share Posted July 26, 2019 New frame rails are 25k+ or so unless you're mechanically inclined and can do it yourself. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-428829 Share on other sites More sharing options...
zumogo Posted July 30, 2019 Author Share Posted July 30, 2019 https://photos.app.goo.gl/hr97rzshoxvNybBd8 1991 Mack superliner With a 1996 E7 engine 8 speed transmission Just bought it wish me good luck Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429026 Share on other sites More sharing options...
JoeH Posted July 30, 2019 Share Posted July 30, 2019 Nice looking truck. How many hours on the clock? My 95 e7-350 has over 19,100 hours. Hasn't needed much. Watch your pyrometer when pulling hills, my e7-350 doesn't want to be taken over 1025 degrees, but it'll easily do 1150. Gotta be careful to not over heat the heads. You'll wish for more hp sometimes, but that motor will keep you on the road, not in the shop. And at the end of the day that's good on your bottom line. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429045 Share on other sites More sharing options...
zumogo Posted July 30, 2019 Author Share Posted July 30, 2019 JoeH The engine has some blow-by. It will need a inframe. Hopefully it will keep me busy until the season it's over. Around November. Then I'll get it rebuild. Fingers crossed. Thanks for the tip on the pyro. It has a new radiator and engine mounts. But I have to do some work to it. The exhaust pipe rubs, has a air leak, needs a a/c line and a recharge on the a/c. It also needs the dump body welded and a liner, new tires. In the future I would also like front hub pilot, previous owner did rear with hubs and aluminum wheels. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429051 Share on other sites More sharing options...
JoeH Posted July 30, 2019 Share Posted July 30, 2019 Nice interior; looks like you need a tachometer sensor. And you have a 8LL transmission. Nice trans, mine has one too, but mines a POS in my opinion. Mine shifts nice most of the time, but once in a while it hangs up in gear and ruins my upshift. Mine hasnt had AC since we bought it 12 years ago. I'm guessing its a completely mechanical engine because it's a 91 truck with a 96 engine. Hard to retrofit an ecu. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429054 Share on other sites More sharing options...
zumogo Posted July 31, 2019 Author Share Posted July 31, 2019 Yes JoeH, it's a mechanical engine. I have to pull the choker to shut it off. Thanks Yes the truck for its age has a nice interior. That's why I didn't think about it into buying it. I have seen many Mack's around that age. They all are beat up inside. Let's see how she makes money. Joe is it a Mack Rd that you have? Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429064 Share on other sites More sharing options...
6368 Posted July 31, 2019 Share Posted July 31, 2019 Good Luck with your new truck 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429065 Share on other sites More sharing options...
JoeH Posted July 31, 2019 Share Posted July 31, 2019 (edited) RD688S. Mines a concrete truck. Used to be a dump truck though. Yours it'll be hard to predict how much use the engine has unless it has a ReMack tag on the engine indicating when it was rebuilt. It could have been bought used to replace a blown motor. No telling how much use it had before it was dropped into your truck. Edited July 31, 2019 by JoeH Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429077 Share on other sites More sharing options...
zumogo Posted August 1, 2019 Author Share Posted August 1, 2019 JoeH sweet Mack. Looks like the one I learn how to drive in. Nice truck Well the engine in my truck that replaced the original engine has blow-by. With 700kmiles on the truck not the engine. I don't think it was rebuilt. I finally got all my paperwork ready to go to DMV tomorrow. Dot number was a headache. Because NJ requires dot number for intrastate. And dot website didn't want to give me a number unless it was interstate. I had to call twice and a couple of hours later I got my last requirement to register my truck. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429103 Share on other sites More sharing options...
JoeH Posted August 1, 2019 Share Posted August 1, 2019 13 hours ago, zumogo said: JoeH sweet Mack. Looks like the one I learn how to drive in. Nice truck Well the engine in my truck that replaced the original engine has blow-by. With 700kmiles on the truck not the engine. I don't think it was rebuilt. I finally got all my paperwork ready to go to DMV tomorrow. Dot number was a headache. Because NJ requires dot number for intrastate. And dot website didn't want to give me a number unless it was interstate. I had to call twice and a couple of hours later I got my last requirement to register my truck. I went through the headache a few years ago in PA. Most states now require a usdot number, regardless of inter or intra. It's a way of tracking violations. If you get pulled over and have a violation put against your usdot number but a state is using a state dot number then the violation won't show up in both systems, just the system the violation was put against. By using the universal federal system they do away with companies having multiple operating numbers and hiding violations. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429150 Share on other sites More sharing options...
zumogo Posted August 8, 2019 Author Share Posted August 8, 2019 JoeH I'm still trying to get insurance. I was going to get progressive, but because a ticket I got driving my personal car(no points), they double the quote. So I'm calling a couple of insurance companies trying to get a deal. 21k+ a year is a little excessive. I rather park the truck since I only have until the end of November. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429600 Share on other sites More sharing options...
JoeH Posted August 8, 2019 Share Posted August 8, 2019 Ouch! 21k?? What are you hauling?? I paid 11k/year to haul fuel oil, and that carries a high general liability. If you're new to trucking I'd walk away if you can't find something wayyyy lower. Can't make money with a 21k policy. If you're going to make a living with your driver's license you need to keep it spotless. Hind sight is 20/20. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429604 Share on other sites More sharing options...
JoeH Posted August 8, 2019 Share Posted August 8, 2019 Find a local commercial agent that can shop around for you. Quote Link to comment https://www.bigmacktrucks.com/topic/58292-em7-engine-problem/#findComment-429605 Share on other sites More sharing options...
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