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  1. M

    1989 XR4 150 black max sensor question sn OB263330

    i'm replacing my temperature sender. removed it and it was pretty much rotted. when I look at XR4 wiring diagrams I see a couple of sensors related to the engine temp: 1. a mercury switch on the port side of the engine 2. a water temperature switch on the starboard side 3. a temperature gauge...
  2. M

    merc 150 XR4 prop grease question

    behind the prop there is a grease fitting. what type or brand of grease do i need in there and how much should i inject? thanks for any help.
  3. M

    tool confustion

    my service manual states i need to use tool 91-34377A1 on the drive shaft. However, while searching for this tool, i found some sites that state that number supersedes to 91-90094. ok. while searching for that number, i end up with another site telling me to use 91-56775T. all i want to do is...
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    drive shaft question

    while reading the Mercury service manual, (yea, i was that bored) the section about installing shims under the bearing for the drive shaft, the manual states to use the Bearing Preload tool, where you would lift the shaft up and hold in place with the locking collar. my question is, what is the...
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    water pump: hole question

    new water pump and i noticed the new (and old) have a hole back by the water tube inlet. can any one tell me why they have this hole there? it goes thru both housings and i never saw any gaskets for it when i removed the old pump. what function does it do? see attached.
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    lower unit question

    1988 Mercury 150hp XR4 Magnum II Lower Unit: The upper drive shaft bearing was shot, so i removed it myself and will be replacing it soon. The lower bearing is fine. The diagrams i look at show a shim under the bearing for backlash adjustments. However, there was no shim under the old bearing...
  7. M

    Mercury 150hp XR4 lower unit question

    i have a 1989 Merc 150 XR4. The input shaft on the lower unit is froze and will not turn. I thought the engine was seized at first because that wouldn't even turn, but, once i dropped the lower unit, it turned freely without the spark plugs. (whew) So, now my problem is the input shaft on the...
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