Diesel Mechanic Quiz........

[Nyoest]

I gotta' say that I missed the "intake valve" thing the first time through sitting here all bleary eyed sucking coffee. .



Very good... ... ...



Kinda' like the old "Do you stock a water pump for a VW Bug???"



Mike.

My favorite was asking for a lower radiator hose for a super beetle... ... .









Yes you gentleman are correct, absolutely no intake valves on these dudes. I love throwing stuff like that out to keep people on their toes.

 

[tuffs93]

These are money makers. I have made a ton of money over the years on Drip-troits. Like owning a old Harley, If it aint leaking oil, you better check the level

 

[CKelley1]

it has 4 exhaust valves and intake ports all the way around the cylinder about half way down. i have a 6v71 in my diamond reo mixer truck with a 5 speed main box and 4 speed brownie. for some reason my employees do not like to run it. could be i need new upholstery

 

[GCroyle]

I gotta' say that I missed the "intake valve" thing the first time through sitting here all bleary eyed sucking coffee. .



Very good... ... ...



Kinda' like the old "Do you stock a water pump for a VW Bug???"



Mike.

Mike,



Do you need the water pump for the rear engine Bug or the front engine Bug? different part number of course.

 

[Nyoest]

it has 4 exhaust valves and intake ports all the way around the cylinder about half way down. i have a 6v71 in my diamond reo mixer truck with a 5 speed main box and 4 speed brownie. for some reason my employees do not like to run it. could be i need new upholstery

Maybe it's because it takes two day for their hearing to come back or their elbows to heal up!



Sounds like a neat ol truck. Love to see a pic.



I've got a 3-71 in an allis chalmers hd 7 dozer. After running it and getting on my fathers 955 I always think the cat is sick.

 

[mwilson]

it has 4 exhaust valves and intake ports all the way around the cylinder about half way down. i have a 6v71 in my diamond reo mixer truck with a 5 speed main box and 4 speed brownie. for some reason my employees do not like to run it. could be i need new upholstery

Not a good choice of truck to drive if you are a little arthritic or hate loud noises.....





Old trucks never had cup holders, there wasn't time between shifts to scratch your head. Never mind trying to pick up a coffee cup for a sip... ... ... ... ... ... ... ... .



Mike.

 

[mwilson]

Mike,



Do you need the water pump for the rear engine Bug or the front engine Bug? different part number of course.

The old "Answer one question with with another question" routine. They never even see it coming!!!



One of the first things that I taught Seth about the truck parts business!!!!!!



Mike.

 

[mwilson]

What it is mounted in... ... .



Old cylinder kits.....

 

[Bill Stockard]

it has 4 exhaust valves and intake ports all the way around the cylinder about half way down. i have a 6v71 in my diamond reo mixer truck with a 5 speed main box and 4 speed brownie. for some reason my employees do not like to run it. could be i need new upholstery

It took me years to convert one of my fleet customers to NH230 Cummins engines from Detroit 6-71s in his I-H Paystar 5000's. He wanted his ready mix trucks equipped with 6-71s because they didn't have enough low speed torque for the drivers to tear up the drive lines. The Cummins had enough low speed torque that a careless driver could snap a drive line in the right soft ground and/or mud conditions. A broken drive shaft in a mixer truck with a drum full of "hot" ready mix isn't good.



Bill

 

[rscurtis]

Here are some photos of a series 71 crosshead piston for those who have never seen one. It is tin plated cast iron and weighs 8#. Note that the rod is bolted to the wrist pin, as it is alway under pressure and does not require a strong connection like a 4-cycle engine does. The nut is captive inside the wrist pin, held by the cooling nozzle. The lower most ring seals the top and bottom halves. The wrist pin is retained by steel discs. The bottom half has two oil rings not visible in the photos.

 

[mwilson]

Here are some photos of a series 71 crosshead piston for those who have never seen one. It is tin plated cast iron and weighs 8#. Note that the rod is bolted to the wrist pin, as it is alway under pressure and does not require a strong connection like a 4-cycle engine does. The nut is captive inside the wrist pin, held by the cooling nozzle. The lower most ring seals the top and bottom halves. The wrist pin is retained by steel discs. The bottom half has two oil rings not visible in the photos.

Good idea showing the piston, didn't think of tearing the take outs apart here to do that.



Must mention that if the steel discs at the end of the wrist pin are not installed correctly the oil cunsumption will be sky high.



They are installed with a special driver and then tested with a vacuum pump to check the integrity of the seal before the pistons are installed into the liners.



I like the old two strokes, simple by design.



Mike.

 

[rscurtis]

If the bottom ring leaks, it will use oil also. That's how I got this one, it's from a long-gone DD repair shop. They used to test these pistons by filling them with hot anti freeze and looking for leaks.

 

[mwilson]

Ok my turn



If the left motor mount receives the torque driving forward and the right side in reverse... . which side of a remote mount auxiliary transmission case carries the torque... ... in under? direct? and overdrive?



Nick

Several of us have argued about this all day with no solid result.



I may phone a friend before I answer... ...





Mike.

 

[rscurtis]

I'll hazard an answer. In under, the right(passenger side) will be under load. In direct, neither, as their is no torque multiplication taking place. In OD, the left side will be under load, as more torque is going into the box than is being delivered.

 

[B.G. Smith]

Ok my turn



If the left motor mount receives the torque driving forward and the right side in reverse... . which side of a remote mount auxiliary transmission case carries the torque... ... in under? direct? and overdrive?



Nick

First let me say, the left (drivers side) engine mount is under tension and right side is under compression driving forward. It is opposit that in reverse. A remote mounted auxiliery drive wouuld torque in the same direction as the engine in under and overdrive with no torque in direct. bg

 

[mwilson]

A Little Better Technology

Next one up after Nick tells us who is right...



I'm leaning with RCurtis.....

 

[GCroyle]

Oh, that's a 1951 Humpenhimer V-7 in straight crank radial underposed config, a rare breed fer shure. Not sure why it has an alternator, the originals just used REALLY large batteries for starting. Burns coal dust, or even oak chips.

 

[Wingate]

aint that an Isuzu. . ??

 

[mwilson]

Oh, that's a 1951 Humpenhimer V-7 in straight crank radial underposed config, a rare breed fer shure. Not sure why it has an alternator, the originals just used REALLY large batteries for starting. Burns coal dust, or even oak chips.

Coal is scarce here, oak chips are far more plentiful... ... ... . :-laf



Mike.

 

[mwilson]

aint that an Isuzu. . ??

Nope, designed by a different former enemy... ... ... :-laf



Mike.