In my opinion, the surface area of the crank against the shell will be no match for the very small (in comparison) tab, which will simply bend back once the shell/crank gets hot enough to seize on to eachother..
Maybe not the best words but you get the gist
This is a myth that has been doing the rounds for years, many many vehicles have no tabs on their shells, td5 being well known on here, they do not snap their cranks or run their shells.
Most hgv engines have no tabs, and they do serious mileage, miliion kms is considered normal.
Once the shell has spun for whatever reason the engine is toast tabs or not.
Datatek
Well-Known Member
I have seen seized crank journals that have ripped the shells to bits but the shells have not rotated.
That's more than I've seen
Also, shells are slightly oversize so they are a spring fit.. if that's the right term.. there must be more friction between the hard outer part of the shell and the block, than between the crank and the soft inner part of the shell
Hope this is of interest ref shells spinning
tyregeezer
Well-Known Member
Yes mate is called calculated crush, all bearings fit in this manner, bearing of multiple layers called a sputter bearing new word I learned the other day Lol when the bearing gets enough grip on the crank they will spin regardless of notch
Page 5.
All four of the piston cooling nozzles are present!
Yip, only when they deprived of oil or debris has made its way into that gallery
tyregeezer
Well-Known Member
Not changing oil has big effect too
dubbleRR
Well-Known Member
And oil dilution from excess diesel ,due to a blocking DPF but thats another story
..
tyregeezer
Well-Known Member
Ooh jeez, those first two are a tad worn what are the surfaces like on the crank
what are the surfaces like on the crank
tyregeezer
Well-Known Member
These were fitted to believe it or not, a new crankshaft or was nearly new I suspect a recent rebuild crank needed just a polish and is back in another block with kings, don't hold me to this as am not sure
Mains caps were not the fight they normal are
Was it assembled dry and not primed crank checks ok run out, sizes fine polished nice so not sure, crank now inside this, shell coating had left a line round one of the journals but polished out
Mains caps were not the fight they normal are
Was it assembled dry and not primed crank checks ok run out, sizes fine polished nice so not sure, crank now inside this, shell coating had left a line round one of the journals but polished out
Attachments
freelance
Well-Known Member
Fitted dry, and oil pump not primed before first start, I remember stripping an engine that had recently rebuilt, and the pistons/rings were in a terrible state, I asked the mechanic if he had oiled the pistons before assembly, he replied “ I can’t remember that, it was a few weeks ago “. I took that to mean….. no !
tyregeezer
Well-Known Member
Your right, answer should have been of course
Datatek
Well-Known Member
Might be cheaper to find a working one from a scrapper as the block on yours may be beyond rebuilding.
tyregeezer
Well-Known Member
Yes best route as above used motor one you can hear running, have seen prices of 8-10k for exchange
