Plastic? On a Dipstick?

Kanzaki Dipstick Transmission oil inspection time: See that little yellow ring on the right? Well it is supposed to be attached to the yellow wing nut. The yellow plastic wing nut. This is a diesel transmission, and they used a plastic wing nut on the dip stick?

DipstickThis looks like something designed for a lawn mower. The fracture occurred where the threads begin, where the o-ring seats — where compression turns into shear. This apparently is a common problem based on searching the cruising forums.

So now, we have a new one on order, and I have to extract the fractured piece in such a way as not to get any fragments in the transmission. This is where plastic may work in our favor. A slot screwdriver firmly pressed downward while twisting should do it.

Geez, plastic

5 responses to “Plastic? On a Dipstick?

  1. I got tired of replacing the plastic dip stick cap/tube assembly every 2-3 years. Seems no matter how careful I was, the plastic cap/threaded portion eventually shears off. I suspect that the plastic is slowly degraded by contact with the transmission oil combined with heat.

    So, I made a replacement out of anodized aluminum that can have the existing Yanmar dipstick tube inserted into it or it comes with a new dipstick tube. See the attached pictures.

    The one shown is for a Yanmar KM35A transmission and is a direct replacement for Yanmar part 177070-62450. I have since verified that this is the correct part number for the dip stick on a KM35A. Some had posted in this group earlier that PN 177074-02454 was the part number for the KM 35A dipstick but that turns out to be incorrect.

    Yanmar part 177074-02454 is the dip stick for a KM3A1 or KM4A1 transmission and it is .875″ (7/8″) longer than the 177070-62450 dipstick for the KM35A.

    I am offering these hard annodized aluminum versions for sale both as a complete assembly (YM1001-01) to replace the Yanmar part 177070-62450 for the KM35A and similar and also just the cap (YM1001-00) that can be used with any existing Yanmar transmission dipstick that has the same type of hollow dipstick tube. So you can purchase just the Cap only (YM1001-00) and take the hollow tube out of the original Yanmar plastic cap (just push the tube up into the cap and a plastic insert will pop out of the Yanmar cap to allow the tube to be removed) and put it into my aluminum cap and no more plastic cap problems.

    Prices:
    Part number Description Price
    YM1001-00 Dipstick Cap only to replace the plastic cap
    Can be used with original Yanmar dipstick tube $75
    YM1001-01 Dipstick/tube assembly for Yanmar KM35A (replaces 177070-62450) $85
    YM1001-02 Dipstick/tube assembly for Yanmar KM2P(-1) and KM3P (replaces 177088-02451) $85
    YM1001-03 Dipstick/tube assembly for Yanmar KM5A (replaces 177074-02500) $85

    Yes, I know – more than twice the price of the Yanmar part but it will be the last one you’ll ever buy and you won’t discover a bilge full of transmission oil while you are cruising because the plastic part broke.

    I can be reached via email at bob@caribluemarine.com or by telephone 310-736-4376

    Bob Atkins
    Cariblue Marine
    http://caribluemarine.com/

  2. Now you’ve got me worried! This is going to make me put off the next transmission fluid change even longer.

  3. Yanmar? Yes I managed to break ours off too. A shame since the rest of the engine is beautifully made and I love it! Great engine!

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