Neuss D358 Engine in ACCO

Looking for help with one of these using water. Farm friend purchased at another farm clearing sale 4 years ago.
Originally a shire truck, dropside tipper body. ACCO 1830 like Southbound's pic on Last ACCO post by Swishy.
Noticed temp. rise and need for coolant top up. Continues to use water - steam and drops noticed at engine breather.
Tried a black gooey leak remedy, but lump of that spat out the breather pipe too. Oil blowing out there since that.
Starts and runs well and truck ideal for their needs. Runs 30k into town and back with stock etc.
Truck would have been unused for periods and no idea of the coolant condition.
Does not sound good to me - coolant being forced out. Another forum mentions liner O - Ring failure.
Would members with experience / knowledge be able to make suggestions please.
Might be a John K remedy - find a Perk for it. Thanks all, Paul.

if there is air/bubbles in the coolant ,it wont be a pinholed liner or O ring.....if its just water in the oil ,then I d think a pinholed liner to be most likely.........if the O rings are leaking,its likely to be a lot of corrosion in the block...........are there any spares for the Neuess motors?......they were also used in tractors.

Thanks John, check out those suggestions when visiting in a couple of weeks.
Key is the water drops and steam coming out the breather, which is on the side plate.
Reading about the motor, found there are 6 welsh plugs in the head, probably some or
all under the rocker cover. Can leak, with water going down push rod holes - into sump
and maybe out breather. Hope that's all it is, though there are many mentions of the
liner, o-ring and corrosion issues. Local truck mechanic says he's baffled, but then he
might not want to get involved.
As you said, widely used motor in IH trucks, tractors, harvesters and light earth moving
gear. Parts still available but expensive motor to do up. Work shop manual copy $33.
Maybe some of the tractor contributors have some ideas too. Thanks all, Paul.

If its been run on plain water ,then a pinholed liner is very likely....I can understand the mechanic......he doesnt want to get involved in pulling down a motor where the block will turn out to be a writeoff......if the liners and block are badly cavitated /corroded ,then it wont be possible to just fit liners,the lower register in the block will have to be repaired before the seal rings can be pushed in.............Ive done this a lot with Caterpillar motors,using Devcon.....The correct method is to install small repair sleeves in the lower block,or you can get custom made liners with oversize OD,requiring the block be machined...All very costly in a Neuess.

Ive got a head off a "blue"358 Neuess over in one of the containers,I fancy they may have stainless welchplugs.......dont remember exactly.....I did have liners and pistons from the same motor kicking about,remember I gave a liner and piston to Skanzerla for his Hough loader......the guy is running a four with one rod thru the block,been like that for years,runs on three cylinders.

Thanks John. Been up to their farm so more on the Neuss motor. Seems only water as coolant prior to and since they've owned it.
Likely to be liner corrosion as you say. Baffling part was why water was running out engine breather. If welsh plugs are stainless,
then perhaps cooling system pressure escaping from head gasket into side gallery and out breather. Leak did not show up on a
recent cooling system pressure test, but much higher pressure from liner leakage with engine working. Runs well so decision is
to keep it going for now, mainly short trips. Possible repower when needed as the cab, chassis, body and hoist etc in good order.

Would the Perkins 6 354 be the simplest replacement? How about Isuzu 6BG1 or 6BG1T ?
Any comments most welcome. Thanks, Paul.

That is one issue, stainless steel welsh plugs. These are brilliant in my book for the hard to get at ones but you do need some plain steel ones to do one of the jobs they were designed to do and that is to rust out like a sacrificial annode instead of the block or head being eaten away.

The liners pinhole from cavitation ,always in the one spot......if caught in time ,the liner can be rotated 90deg in the block ....... the used truck yards used to solder up the holes ,and give a 30 day warranty.,cause thats how long it would last.......The pinholes typically rust up if the truck is let stand,but start leaking after a few hours running.