Only problem might be the standard breather (vents to atm), it would hold an airlock up to a couple of meters depth, but at 20m - you might get a bit of water in the sump oil. Not to say the engine wouldn't still run though!
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Just sometimes, I wonder if we might be talking these engines up just a little too much.:D
Ive seen a 2.25 diesel from a series running about 5m underwater....
for no other reason than we could and the only reason we didnt let it roll deeper into the dam was the snorkle was only about 20cms above the water and it was a little windblown...
winched it out then drove the paddock basher home...
The seat was a little squishy and the brakes were a little more vague than usual.
I have no doubt's about the 4BD1 having no problems swimming, but in the Tweed floods a couple of years ago we rescued a couple of cars ( people still inside):cool: in very deep water (lapping the windscreen wipers on a 6'' lifted RRC). The motor was faultless but the ancillaries suffered.
1) starter motor failed
2) aircon tensioner pully bearing failed
3) clutch pushrod and thrust bearing seized
4) both alternaters failed due to crappy water
not to mention a full fluid change afterwards.
Wont be doing that again as no one coffed up $$ to repair it
Justin