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Engine Flywheel:

Posted By Post from the Past Monday, February 18, 2008 3:19 AM
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glenn akers
 Posted Friday, August 06, 2010 3:29 PM
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I never heard of cat trying to change to di on that engine.  The reason the heads cracked was same reason the two cycle DD did. And more engine than that  the metal and casting procedures then was not what it is in later engine and the cooling system was inproven as time went by. The 1693 was changed to a better engine which was same bore and stroke but lighter.They also to had cracking problems but the precup engine i think did run hotter at the head.Even to this day cat has more heads to crack than any other engine does.The E model and later C15 would crack between the valve seats and it was mostly surface cracks but when looking at acrack it is hard to tell how deep it is. The funny thing is when you get a reman head the crack has been ground or milled down deep into the head between the valve seats and you dont see the crack because the metal has been removed.Any way that is what i think.

glenn akers
Friday, August 06, 2010 3:31 PM by glenn akers
OrrinS
 Posted Friday, August 06, 2010 9:16 AM
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I bought a '76 KW in'07 because iy had a 36" sleeper and was twin screw...AND mostly because it had a 1693 T/A.  Loved the way it pulled in the low RMP range and the sound of it!  Only drove it 3,200 mile and that sure did prove the fact it was a fuel-hog vs the turned big cam 1 in my s/a '76 KW.

If I'm correct the heads cracked easily when over heated and that was mainly due to it being a pre-cup block.  Wonder what it wold have been like if converted to direct injection!  Lot cooler and I'd think good or at least better mileage figures that the 3.5 to 4.8 mpg I got on my trip out west.

Anyone know if this was ever tried.  The fellow who does my cummins work say he thinks there are enough parts around to do the job.  We just never had the $$$ for the experiment  ...LOL


OrrinS
Albany, NY area
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glenn akers
 Posted Friday, May 14, 2010 5:11 AM
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Yes i remember the DD plugs now but can not remember what Frank is talking about. I guess that is what happens when you get old and been used too much.

glenn akers
junkmandan
 Posted Friday, May 14, 2010 4:23 AM
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Detroit had heat sensing plugs on the exhaust side of the head ,visable only when the exhaust manifold was removed .[At least on the 2 strokes].
Post from the Past
 Posted Thursday, May 13, 2010 11:19 PM
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The little disc I was referring to in the old 93s were made of disimilar metals in the earlier years , with a small spring inside of them they looked like micro mini thermostats, designed to come apart it the engine overheated. it seams to me if I recall correctly that there were something like 24 of these, it has been a long tiime since I had the head off of a 1693.

  I remember the "Oring" type as well but don't remember those being used in the 93s, the little by-matalic disc could actually be placed in the wrong locations if you wern't careful which would block water passages between the spacer plate and the head

 but you need to remember it has been 20 years since I had the head off of any cat engine. so I can be miss remembering things.


 
glenn akers
 Posted Wednesday, May 12, 2010 3:28 PM
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Most rebuilder will change them but maybe not all of them. It is there for waranty reasons. The cummins is a plug that will melt the back side.Never did know of DD usingf them. But the later engines will have trhe events stored in the ECM for ever.

glenn akers
Rob
 Posted Wednesday, May 12, 2010 2:48 PM
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They are calibrated to melt or deform at a specified temperture. A lot of cylinder heads are fitted with them, (glued on) after a rebuild or refurbishment. They are a tell tale sign of overheating and a good way to void any type of warranty.

Rob
Rogerstar1
 Posted Wednesday, May 12, 2010 12:39 PM
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"
Frank Surber (5/12/2010)
Since this thread was dug up and the subject matter morphed into an almost new topic I will add to John C's comment 

   Accidently place the tattle-tail heat discs in the wrong position when changing or reworking the head and you guaranteed yourself a warranty job within 5000 miles." 


Frank - the little tattle- tale heat discs you refer to...my mechanic mentioned something about items resemblng o-rings or ferules  on the head ...quite a number of them and they all appeared to be heat damaged and in need of replacement.  The heat discs...where do they fit on the head and what is there function?  I  appreciate your insight and your patience.    R. Durban
Wednesday, May 12, 2010 1:05 PM by Rogerstar1
Post from the Past
 Posted Wednesday, May 12, 2010 11:59 AM
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Since this thread was dug up and the subject matter morphed into an almost new topic I will add to John C's comment

as with the early Chrysler hemi the 1693 was  love hate relationship you either loved them and thought nothing in the world was better suited for your truck or you hated them.

 If you owned the truck and had a hired driver on it you never slip seated one to do so meant that every scheduled maintenance service you spent double of what you would on a truck with an assigned knowledgeable driver.

as for the design of the engine it was about 30 years ahead of its time in some respects and 20 years behind in others.

 The monstrous Switzer turbo could build obscene boost pressures if the waste gate malfunctioned

 the oil pump could circulate over 120 gallons per minute @ pressures of over 100 PSI so much that with the brakesaver applied it had a pressure restrictor to keep from washing the bearings out on the crank.

  The oil cooler was so huge and wedged between the frame and block that it was nearly impossible to work on without raising the engine from its mountings. use the wrong colored "O" ring on any of the oil lines and you had 18 gallons of oil on the ground  as soon as you started the engine and before you could shut it off.

   Accidently place the tattle-tail heat discs in the wrong position when changing or reworking the head and you guaranteed yourself a warranty job within 5000 miles. Reuse the flywheel bolts without placing them in an oven @ 300 Degrees for 4 hours than allowing them to return to ambient temp over a period of an hour and you could have 600 lbs of rotating parts come off the back of the engine. (That was a little cat trick I got  from an old CAT mechanic not sure if it was the recommended procedure or not)

   Look at a Detroit series 60 real close and see some of the charterers of the 1693  


 
John_Costley
 Posted Tuesday, May 11, 2010 10:46 PM
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Roger,

The 1693 Cat is kinda like the 392 Hemi.A hell of an engine in its day that folks still tell stories about.Theres some still on the road, though not many being driven everyday.Parts are out there, though some are getting pretty rare.Value....all depends on how bad someone wants it.Not many still trucking, so the value of a retarder is pretty low.John 

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