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  1. M

    Oil pressure dropping

    A new sending unit was installed and the old one was pressure tested and checked out resistance wise. I have a pressure port fitting on order and will be adding a mechanical gauge to compare.
  2. M

    Oil pressure dropping

  3. M

    Oil pressure dropping

    Here’s an update. I changed the oil using an electric pump attached to dipstick tube (dipstick connects to the bottom of the oil pan) and got about 7 quarts out. It supposedly has a 5 qt. Pan so it was definitely overfilled. The oil came out black for only having 5 hours of use, so I think...
  4. M

    Oil pressure dropping

    The mercruiser manual that came with the boat states Max. RPM @WOT 4000-4400. This is a 260hp pre-vortec flat tappet cam carb'd engine. I agree a higher WOT rpm means the engine isn't working as hard.
  5. M

    Oil pressure dropping

    Scott, Thanks for the reply. This is a new base engine from MM and the other side is a rebuilt 355. The rebuilt engine has lower oil pressure (larger clearances) in general, but doesn't have this problem. I haven't run the engines WOT yet because the rebuilt engine is still being broken in. I...
  6. M

    Oil pressure dropping

    Hi all, I'm having an oil pressure issues with one of the mercruiser 5.7's on my boat and I think its a windage problem. This is a new 5.7 long block from M.M. with about 30 hours on it. The oil pressure is great on startup (60 psi) then drops to about 30 psi at hot idle. The pressure...
  7. M

    Hurth transmission help

    Thanks I’ll get a gauge and check the pressure. I did notice this transmission had a little whine when I put it in the water.
  8. M

    Hurth transmission help

    I have a pair of ZF63A (HSW 630 actually) transmissions behind my Mercruiser 5.7’s. This morning I backed out of the slip with both engines in reverse then tried to spin the boat by shifting the port gear into forward and nothing happened. This transmission will not go into forward or reverse...
  9. M

    Dip stick / Oil level issues

    I'm having oil pressure problems with my newly installed replacement engine. I have 50+ of oil pressure, then when I hit 3000 rpm's the pressure slowly drops to about 25 psi. If I drop the rpm's down to a bit the pressure jumps right back up to 50 psi. I thinks its a windage issue caused by...
  10. M

    Milky oil

    When I checked the oil on my port engine the dipstick was covered in what I thought was milky oil. It looked slightly foamy and whitish. So I changed the oil and it came dark brown/black. It didn’t seem like any water was in actually in the oil. This engine has the external dipstick that...
  11. M

    1994 Mercrusier 5.7 timing

    HI, I just replaced one of the 5.7 mercruiser engines on my boat and I’m getting conflicting information on the base timing for this engine. The original engine was a 1994 5.7 bluewater ( S/N F490119). I found one manual that said the base timing was 8 Degrees BTC and another that said 10...
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