lamountain1976 Posted February 12, 2008 Share Posted February 12, 2008 It seems like it takes awhile for pressure to build in the system. How long would you expect it to take for an older truck to build up pressure, and what could be causing the delay? I replaced the compressor and governor, the dryer and fixed several leaks. Quote Justin LaMountain Consulting Forester and Horselogger Green Man Forestry Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/ Share on other sites More sharing options...
ThaddeusW Posted February 12, 2008 Share Posted February 12, 2008 Not too sure but a Freightshaker box truck I drove not too long ago took well over a minute, maybe three, to fill the system from empty at idle. Revving the engine helps get it up to pressure faster but it should still take about a minute. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-16972 Share on other sites More sharing options...
Lmackattack Posted February 12, 2008 Share Posted February 12, 2008 from 0 to 125 psitakes my R model w/new compressor about 4-5 mim at low idle RPMat high idle takes about 3-4 min Quote Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-16978 Share on other sites More sharing options...
lamountain1976 Posted February 12, 2008 Author Share Posted February 12, 2008 from 0 to 125 psitakes my R model w/new compressor about 4-5 mim at low idle RPMat high idle takes about 3-4 minYeah it seems to take about 5 minutes, less if I rev the engine. On the subject of idle, what is a good setting? I have to go by sound, because the RPM gage is not functional. And, I know many diesels have glow plugs, do these macks as well? And so do you have to wait in the "key on" position for a moment and then start? Because I wonder what kinds of things can make a truck easier to start in the winter? Quote Justin LaMountain Consulting Forester and Horselogger Green Man Forestry Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-16980 Share on other sites More sharing options...
HeyCharger Posted February 12, 2008 Share Posted February 12, 2008 Remember, if you have an air starter, it will take a lot longer to reach full air pressure as your air-start tank is being filled as well. Quote Proud owner of;1961 Mack B61 prime mover.1981 International ACCO 1810C DualCab Fire Truck Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-16981 Share on other sites More sharing options...
lamountain1976 Posted February 12, 2008 Author Share Posted February 12, 2008 Remember, if you have an air starter, it will take a lot longer to reach full air pressure as your air-start tank is being filled as well.Hmm, an air starter? Quote Justin LaMountain Consulting Forester and Horselogger Green Man Forestry Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-16983 Share on other sites More sharing options...
HeyCharger Posted February 12, 2008 Share Posted February 12, 2008 Hmm, an air starter?Yes. One of the greatest sounds on this earth (and real good for scaring the crap out of bystanders ) Quote Proud owner of;1961 Mack B61 prime mover.1981 International ACCO 1810C DualCab Fire Truck Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-16984 Share on other sites More sharing options...
MACKS Posted February 12, 2008 Share Posted February 12, 2008 You should add an engine block heater for cold winter starts,a few hours with heater on and she will start like it's summer,also much better for the engine . Quote Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-16985 Share on other sites More sharing options...
ThaddeusW Posted February 12, 2008 Share Posted February 12, 2008 Yeah it seems to take about 5 minutes, less if I rev the engine.That sounds just fine. The freightshaker I had didn't even have a wet tank, only two smaller air tanks for front and rear. Since you have a tandem and a trailer I am sure you have way bigger tanks. Air starter : Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-16989 Share on other sites More sharing options...
lamountain1976 Posted February 13, 2008 Author Share Posted February 13, 2008 That sounds just fine. The freightshaker I had didn't even have a wet tank, only two smaller air tanks for front and rear. Since you have a tandem and a trailer I am sure you have way bigger tanks. Air starter : Ha that was great. I definitely do not have an air starter, but I wish I did after hearing that. I do have a block heater, which is nice right now, but I usualy leave the truck on the job in the woods. So I guess I need to find a hell of a long extension cord... Quote Justin LaMountain Consulting Forester and Horselogger Green Man Forestry Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-17008 Share on other sites More sharing options...
MACKS Posted February 13, 2008 Share Posted February 13, 2008 LOL, or just leave it running all night ! Quote Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-17010 Share on other sites More sharing options...
skip Posted February 13, 2008 Share Posted February 13, 2008 It seems like it takes awhile for pressure to build in the system. How long would you expect it to take for an older truck to build up pressure, and what could be causing the delay? I replaced the compressor and governor, the dryer and fixed several leaks.They do take a while mate, as everyone else has mentioned. One thing you can check though, if its an E6 engine, they have a steel pipe on the discharge side of the compressor, and it has 2 90 degree bends in it which are prone to building up with oil and gunk. This will restrict the flow in a big way. Ive cured this by running a flexible hose straight to the wet tank. It will probably have a flexible hose on it already that joins to the end of the steel pipe and it can be porous from being hot and with the sound of the engine running you will never hear it leaking. you can remove the hose from the compressor and hook it into a separate air supply and if it leaking you may hear it that way. See how you go mate. Cheers. Skip Quote Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-17014 Share on other sites More sharing options...
lamountain1976 Posted February 13, 2008 Author Share Posted February 13, 2008 They do take a while mate, as everyone else has mentioned. One thing you can check though, if its an E6 engine, they have a steel pipe on the discharge side of the compressor, and it has 2 90 degree bends in it which are prone to building up with oil and gunk. This will restrict the flow in a big way. Ive cured this by running a flexible hose straight to the wet tank. It will probably have a flexible hose on it already that joins to the end of the steel pipe and it can be porous from being hot and with the sound of the engine running you will never hear it leaking. you can remove the hose from the compressor and hook it into a separate air supply and if it leaking you may hear it that way. See how you go mate. Cheers. SkipI didn't like that steel line either, the one that comes out of the block and into the compressor and carries coolant. So I ran a flexible, high pressure hydraulic hose when I replaced the compressor and governor. But maybe you are talking about a different line? Quote Justin LaMountain Consulting Forester and Horselogger Green Man Forestry Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-17018 Share on other sites More sharing options...
skip Posted February 14, 2008 Share Posted February 14, 2008 I didn't like that steel line either, the one that comes out of the block and into the compressor and carries coolant. So I ran a flexible, high pressure hydraulic hose when I replaced the compressor and governor. But maybe you are talking about a different line?That wasnt the line I was referring to mate but you're right, it can be a pain too. Every time you take it off you have to replace those thick orings. The line I was referring to is the discharge line that goes to the wet tank. They used to use a steel pipe and then it joined onto a flexible hose when some of the heat had gone out of the pipe. Cheers mate, Skip Quote Link to comment https://www.bigmacktrucks.com/topic/3411-air-pressure/#findComment-17036 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.