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D6C lines crimped off

Tommyc · 2026-01-06 19:39

Hey all, Just bought a D6C 76a and these two lines are crimped off. The line off turbo im sure is a vent line and the other line im guessing is the other half of pipe. Question is why would someone do this? Am I missing something

Replies11
  1. #1Tyler d4c2026-01-06 19:48

    .

  2. #2Nige2026-01-06 20:35

    A line for a water-cooled turbo.? Is there a line connected out of the opposite side of the turbo to the crimped-off one shown in your 3rd photo.? Does the turbo have a tag with a Part Number on it.?

  3. #3pittsburgh cat man2026-01-06 21:28

    the little line looks like the filter bleed line

  4. #4Tommyc2026-01-06 22:34

    It’s got a tag. Part number is 3S4259

  5. #5Old Magnet2026-01-06 23:44

    Should have an oil supply line (present) Vent line (present) Drain line (crimped) My guess is oil leakage was excessive so someone crimped the drain line.

  6. #6Coaldust2026-01-07 00:52

    The oil drain line is on the bottom of the center housing. The clipped line is a crankcase vent, which is supposed to go to the crankcase. I’m surprised to see a three-holer center cartridge still in the wild. By now, most of those old D333’s have been converted to 3306 turbos.

  7. #7Old Magnet2026-01-07 01:12

    I'm looking at the parts diagram for the 3S4259 and the large line is the vent line.

  8. #8Tommyc2026-01-07 05:41

    Thanks all. I might plumb in some sort of breather and let it vent to atmosphere

  9. #9Old Magnet2026-01-07 13:31

    Here's what the Parts Book Shows....

  10. #10Welder Dave2026-01-11 00:01

    How would the blocked off vent line affect the engine, blow seals out, etc.?

  11. #11Old Magnet2026-01-11 14:13

    On further investigation.....