Was doing a bit of reading on the CP4 HPFP and found this slide show showing the assembly of the Duramax engine which uses the same HPFP as the 6.7 PSD. Thought you might enjoy looking at it, too. Was surprised at how many internal engine parts,looks like all the reciprocating parts are manufactured in Japan and shipped over here. Guess Isuzu is still involved in production of the engine. http://www.dieselpowermag.com/features/c........_the_duramax_diesel_engine/photo_06.html
Notice the marks after machining of the cylinder bores, wonder about the oval shapes on the walls.
Capt Skup
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Quote: Notice the marks after machining of the cylinder bores, wonder about the oval shapes on the walls.
There is a specification on that and is also referred to as cylinder cross hatching
Specific, as it is the basis for cylinder/ring break-in
That happens in the first few hundred miles or less
The peaks are to be 'moved', not 'cut' off by the rings to become plateau's that
is part of the ring to cylinder seal to contain the combustion gases
Then the valleys become oil reservoirs that wipe oil onto the rings to 'float'
them off those plateau's. So there 'should' never be any metal on metal between
the rings and cylinder walls
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1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...
Quote: Notice the marks after machining of the cylinder bores, wonder about the oval shapes on the walls.
There is a specification on that and is also referred to as cylinder cross hatching
Specific, as it is the basis for cylinder/ring break-in
That happens in the first few hundred miles or less
The peaks are to be 'moved', not 'cut' off by the rings to become plateau's that
is part of the ring to cylinder seal to contain the combustion gases
Then the valleys become oil reservoirs that wipe oil onto the rings to 'float'
them off those plateau's. So there 'should' never be any metal on metal between
the rings and cylinder walls
I believe the Cap is talking about the "leopard spotting" hardening process and not cross hatching.
~ Too many freaks & not enough circuses ~
"Life is not tried ~ it is merely survived ~ if you're standing
outside the fire"
Interesting how they go together, probably a good piece of equipment, but what a scary thing to look at after it is all assembled, it must be a nightmare to work on that thing.
woodhog wrote: Interesting how they go together, probably a good piece of equipment, but what a scary thing to look at after it is all assembled, it must be a nightmare to work on that thing.
I would think it must me a nightmare to work on most modern diesel engines and for that matter, modern transmissions.
I remember back in the 1960's a buddy and I taking apart and working on, his GM Muncie M20 4 speed transmission. We had the shop manual to guide us and were able to get it working again.
But neither one of us were much more than a shade tree mechanic. With today's complexity, I don't think many shade tree mechanics are working on a modern diesel or modern gas engine.
I shudder at the thought of doing a major repair on say a Ford 6.0 liter turbo diesel...or for that matter a Duramax or Cummins.
There is a specification on that and is also referred to as cylinder cross hatching
The allowable range of values in that use to be pretty loose, and a good machine shop can take a brand new engine, and blue print it to much tighter specs, resulting in a few % improvement in sealing and friction loss.
With a modern EPA compliant engine, that is pretty much gone as oil control became critical --- to prevent emissions.
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