Recent Posts

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Retired CAT Diesel Mechanic Guidance / C9 hot idle oil pressure
« Last post by jcdata on October 23, 2020, 05:03:22 AM »
My first post!  :)

I am looking at a 2005 Country Coach with 67k miles. The engine is a C9. Does anyone know what the hot oil pressure range is?

I saw documentation on this website denoting a low end of 40-88 PSI however, noticed a lower reading during my drive 20-25 PSI. This concerns me.
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Hey Dave, I've Got a Problem / Re: Exhaust brake concern
« Last post by Out N About on October 18, 2020, 02:25:47 PM »
Whether or not that this was the problem, I didn’t realize that this should be part of my regular service routine. Thanks for the info! I’ll get to it ASAP.
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Hey Dave, I've Got a Problem / Re: Exhaust brake concern
« Last post by Brett Wolfe on October 17, 2020, 03:05:26 PM »
Most exhaust brakes (PacBrake for example) require routine lubrication.  If it stuck shut/did not release you would have no power. Cooling down could cause it to release.  Pretty easy to check if this ever happens again if you can see the exhaust brake.

https://pacbrake.com/product/c18037-superlube/
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Hey Dave, I've Got a Problem / Exhaust brake concern
« Last post by Out N About on October 17, 2020, 01:29:23 PM »
Not yet a problem, just a concern.  While descending from the high country in Tennessee and North Carolina on I-26, I came upon a 6% downhill grade that was 3 miles long.  I utilized the exhaust brake on my CAT 350 HP C-7 ACERT engine to maintain about 30 mph and didn't require any other braking.  At the 1 mile point,  there was a slight uphill grade and was instantly aware that the engine was delivering almost no power, so I pulled to the side and let the engine idle for about 15 minutes.  There were no alarms shown at any time on the dash, only a "exhaust brake" message in the message center, and the coolant temp never exceeded my normal 190.  With normal power restored, I continued my decent, this time without the exhaust brake.  I've read that the derate may have been due to high air intake temps, which given the proximity of the intake and exhaust makes sense.  I don't have a Silverleaf system yet, and there's a molex connector hanging next to the exhaust pipe but no visible sensor on the exhaust, so maybe it isn't measurable.  Question one is did I likely do any damage, and number two is "what is the best way to safely decend long grades beyond going slow with frequent stops along the way?  I take criticism well, so let me have it!   :o
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Hey Dave, I've Got a Problem / Re: 2003/2004 Cat C7 ACERT sudden engine stop
« Last post by RWBFleetwood on October 16, 2020, 01:58:00 PM »
Hello,

We left the Freightliner dealer / shop and discovered, after traveling 400 miles motor oil all over the back of our coach, our bike cover and tow car.  The mechanic left the oil fill cap off so the suction created at the back while driving sucked oil out and made a huge mess.  The good news is nothing was wrong with the repair and the clean up was easily done.  The dealer is providing a refund to cover the cost of clean up and a few errors we discovered on the bill.
The engine seems to be working better with the hew Heui pump.  It would be good to know why the old pump’s drive gear suddenly became loose.  It could have been a shaft failure but without dismantling the pump we will never know.

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Hey Dave, I've Got a Problem / Re: 2003/2004 Cat C7 ACERT sudden engine stop
« Last post by RWBFleetwood on October 14, 2020, 12:22:32 PM »
The new pump came with the gear attached and torqued.  To have it rechecked would involve removing and reinstalling it.

I did go back in the shop and spoke to the mechanic who has 30 years experience.  The engine fired right up.  Test drive was successful.

The pump came from the local caterpillar dealer.



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Hey Dave, I've Got a Problem / Re: 2003/2004 Cat C7 ACERT sudden engine stop
« Last post by David.e.atherton on October 14, 2020, 10:15:32 AM »
RWBFleetwood, my suggestion for after you clear service shop being there not allowing you
around your motorhome. Take it down the road and find a Caterpillar service shop and recheck
the gear that drives the Heui pump to make sure the gear for correct torque and not pushed
Too deep on the shaft on the Heui pump. Got a bad feeling here and have experienced this
before but I’m making you aware of this. Ask Dave, Dave Atherton Retired Cat Mechanic
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Hey Dave, I've Got a Problem / Re: 2003/2004 Cat C7 ACERT sudden engine stop
« Last post by David.e.atherton on October 14, 2020, 09:55:17 AM »
The gear on the Heui pump is held in place with what is called a Morse taper and is a metal to metal fit without a key in shaft. The only thing that holds the gear tight in place is a hex bolt
With harden steel washer. Turning the pump on bench which turns hard is normal because the hp pump is a piston type pump. Last be very sure if the gear connect to pump loosen up the wear would be in the female taper on gear and little wear on the shaft on pump.. this is ahead
is concern because if any wear on a Morse taper the gear will work loose again because the Morse taper is a very close machine part will take very little spinning to gear that will require
replacement. If you want to prevent this problem ahead replace the gear along with the pump.
I’m looking at the caterpillar technical bulletin on what I just explained. Ask Dave, Dave Atherton
Retired Cat Mechanic
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Hey Dave, I've Got a Problem / Re: 2003/2004 Cat C7 ACERT sudden engine stop
« Last post by RWBFleetwood on October 14, 2020, 07:27:34 AM »
As a follow up the mechanic removed the Heui pump, took about 1-1/2 hours.
Once on the bench the failure was evident; the drive gear came loose from the shaft.  It is very difficult to turn the pump shaft by hand.

We are having a new pump installed but would like to know what would cause the gear to become loose and could this be traced to another issue going on that we are not aware of?



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Hey Dave, I've Got a Problem / Re: 2003/2004 Cat C7 ACERT sudden engine stop
« Last post by RWBFleetwood on October 13, 2020, 06:32:21 AM »
Diagnosis is the HEUI pump is not putting out any pressure.   The tech said it must be replaced.
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