Recent Posts

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Routine Maintenance / Re: Diagonal Link
« Last post by Captpar on May 21, 2018, 01:25:48 PM »
Truck mech said it was a diagonal link.
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Cooling System / Re: radiator
« Last post by Charlie/Susie on May 20, 2018, 05:44:01 PM »
Being a former aircraft mechanic, Brett is right about using aluminum safe cleaning products and Simple Green Extreme is a great cleaner. A gallon is about $24.00 and may need to be ordered because of its specialty use. The dilution ratios are printed on the container as a reference but you can use whatever ratio that gives you the best results. As Brett stated, rinse long and well . Charlie.
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Hey Dave, I've Got a Problem / Cat 3126E check engine, won't start
« Last post by dieselnewbie on May 20, 2018, 12:51:15 PM »
We recently purchased a 2002 Newmar Dutch Star with a Cat 3126E on a Freightliner chassis, our first class A.  This unit has been competently and impecably cared for AND improved!  It also comes with the invaluable resource of the availability and knowledge base of the previous owner as the account following will show.
Returning home after the 1st outing we stopped to fuel and afterwards noted that the gauge only showed 3/4 full.  I checked with the previous owner to see if I had short filled or if that reading should be expected.  During the 2nd outing when we fueled I put extra work into making sure we were full and the gauge showed full when we pulled away from the pump.  Within 10 miles the gauge was fluctuating between 3/4 and 7/8.  Within 20 miles I experienced total throttle loss.  I got pulled off the road, parked and contemplated, then called the previous owner who advised that the throttle was electronic and to turn the ignition off, wait briefly for computer re-set and re-start.  This solved the problem.
40 miles later the check engine light came on.  We had been fighting a 40 mph headwind in 95 F and I had watched the temps come up on both engine and transmission but both had stayed under 200.  I drove another mile and then pulled over and parked as we were heading into 100 miles of remote NE Arizona.  I reviewed all pressures and temps as we idled smoothly for a few minutes.  I decided that the nature of the problem might be the same as the electronic throttle and to shut down and attempt to re-start.  There was no re-start.
Having recently fueled I drained some fuel from the water separator.  There seemed to be no water but I felt like it smelled more like paint thinner than good fuel.  The unit has a manual primer and I began operating it without success.  A passerby stopped who obviously had much more diesel experience than I do and attempted to help for 1/2 hr.  One thing we accomplished together was verification that we had throttle operation.  When towed late that night I elected to be dropped at Freightliner where, the next day codes were pulled showing that the HEUI (Hydraulic Electronic Unit Injector) oil pressure was only making 240 PSI cranking which is insufficient.  At this point we needed to rent a car and get my wife back to her dying mother's bedside and leave the unit at Freightliner, 200 miles from home. 
This provided time for me to connect with the previous owner, who in turn contacted Brett Wolfe, who in turn contact David Atherton on my behalf. 
Let the following be a tribute to Dave who rescued this newbie. 
After I emailed Dave with a description of the events I had a return email and phone call within hours.  His diagnosis: 1 of 2 parts need to be replaced.
I called Freightliner the first business day that they were open and told them not to work on my unit & that I would return in 4 days. (after my mother-in-law's burial)  Followed that week from Dave photos and descriptions of the 2 parts plus their locations and even wrench sizes that would be needed by this newbie.   I picked up the parts from 2 Cat dealers and returned to the rig.  Step 1.  Disconnect the Injection Actuation Pressure Sensor.  This is the first sensor from the front of the engine located on top at the edge of the valve cover right by the HEUI pump.  This has a 10" pigtail to the connector into the wiring harness.  Attempt to start.  If the engine starts that confirms the sensor is bad.  It did not re-start so sensor not replaced.  Step 2.  I replaced the Injection Actuation Pressure Regulator (solenoid) at the base of the HEUI pump.  I'll be forever grateful to Dave's coaching that a 1 1/8" wrench was needed for this so that I included it in the toolbox before leaving home.  After replacement the engine started immediately.  All that remained, and certainly the most difficult, was cleaning and re-installing the driveshaft that had been removed for towing.  Time for this 66 yr. old to get back on the weight bench at  the YMCA!!  The fuel gauge appeared to provide a stable, accurate reading during the 200 mile trip home.
Dave Atherton's extensive knowledge, willingness to share it and spend time coaching this diesel newbie saved me thousands of dollars and gave me a good start on getting acquainted with my first power plant.  There is a huge debt of gratitude.
Thanks also to previous owner Wally McCorkle who spends much time coaching me and Brett Wolfe for his time.
Better days ahead!
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Hey Dave, I've Got a Problem / Re: 2005 Bounder 37U Cat C7 Injector knock
« Last post by Brett Wolfe on May 20, 2018, 07:16:55 AM »
From DAVE:

Yes very much , what happen upon starting. Low pressure engine oil at heui pump increases to 870 psi and engine will
start. ( when key is first turned on if you had valve cover off you would hear a short buzzing sound coming from injectors
One at a time in firing order of engine. This buzz test first action to lube the Heui injector. The wait to start lamp goes off
the buzz test is complete ) engine will start. After engine running the Heui pump will increase oil pressure to injectors up to 4300 psi.
Many people take a cold engine and speed it up thinking same thoughts of gas engine in a car. Caterpillar programmed
the engine ECM to make sure engine oil is warm enough to lube Heui System. In cold weather warm up takes longer but
In spring and hot summer the cold mode is still active. The cold mode tell when every is ok via: coolant temperature.
While engine is in cold mode, idle is not stable go up and down . Engine has low power or loss of power when person
Starts up and starts going after air pressure is built up. Raddle or knocking or missing sound at exhaust from injectors.
This all goes away after correct time to warm up engine. Have answered many post and many calls on this subject starting
and engine is gutless.  Brett, can you post this on Ask Dave
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Hey Dave, I've Got a Problem / Re: 2005 Bounder 37U Cat C7 Injector knock
« Last post by Brett Wolfe on May 20, 2018, 06:25:01 AM »
Dave,

Just to clarify, are you recommending that, after a minute or two to allow oil circulation one does NOTuse the cruise control to increase engine speed to around 1,000 RPM for faster warm up?

Thanks.
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Ken, there is not any problem here. All Caterpillar HEUI injection systems have a engine
production built into the engine ECM that will not allow you to just start up and drive without
first letting engine warm up. The engine will idle up and down, injectors sounds like. Missing of knocking sound, taking off there is reduced or low power. This is what is called Caterpillar
cold mode to product your engine and it takes 12 to 15 minutes to get engine to operate
Temperature. Many questions have been posted about start up with Heui injection systems.
The injectors are all operated on high pressure engine oil and damage will happen if person
set cruise to around 12 rpm to speed up warm up. Yes it is happening and think about thick oil
be forced under very high pressure and sizing of parts that have a very close machine fit.
Again damage has happen, and injector may result by not letting engine warm up.
Ask Dave, Dave Atherton Retired Cat Mechanic
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Hey Dave, I've Got a Problem / 2005 Bounder 37U Cat C7 Injector knock
« Last post by Ken Carpenter on May 19, 2018, 10:02:04 AM »
2005 Bounder 37U Cat C7 Injector knock

After a cold start, when the engine coolant reaches about 106F, I get injector knock which disappears at about 130F. Do you think the engine temp sender located under the fuel filter could be faulty? Total engine mileage 29K with annual oil changes.

Thanks in advance, Craig
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Routine Maintenance / Re: Diagonal Link
« Last post by Brett Wolfe on May 18, 2018, 02:51:55 PM »

Again, a picture is worth.................

If sway bar bushings, strong suggestion-- replace with POLYURETHANE bushings. 
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Routine Maintenance / Re: Diagonal Link
« Last post by Charlie/Susie on May 18, 2018, 01:27:05 PM »
Captpar,  I have a 2005 Freightliner chassis and it sounds like it may be the torsion bar( sway bar ) in front. There are two mounting rubber grommets attached to the frame and then two arms on each side that attach to steel rods that also have rubber isolators attached. This is IMO critical to the handling of the steering and front end roll. I replaced all rubber parts and torqued to specs, easy DIY project, and it made a world of difference when it came to body roll. Hope this helps. Charlie.
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How to Post Topics and Replies / Re: Exhaust manifold bolts
« Last post by dcahill48 on May 17, 2018, 08:52:13 PM »
Thanks for the quick reply Dave . I'm in Massachusetts and will look around for a reliable shop . Thanks again for the advice .
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