Search results

  1. D

    Oversized Valves needed for Mercruiser 140 3.0L

    I appreciate the replies y'all. I'll be taking my head to an actual machine shop to look into the bronze guides. Thanks, Douglas
  2. D

    Mercruiser 3.0LX Bogging down at 2K rpm ?

    I had a very similar issue with my Mercruiser 140 last summer. Idled perfectly and accelerated fine but when I got to 1800 - 2200 RPMs, it would stall and lose power horribly but if I pushed past up to 3000 it smoothed out or it seemed. Turned out my mechanical advance mechanism in my...
  3. D

    Oversized Valves needed for Mercruiser 140 3.0L

    Hi everyone, I am searching for a source for oversized valves for my 1985 Mercruiser 140. Mine has worn out guides (~.008" side clearance) and is pulling in oil to the combustion chamber. They seem to be hard as heck to find. Might have to make my own guides and ream them. What have y'all done...
  4. D

    Mercruiser 140 head retorque proper technique

    Appreciate the pdf! I'm def not racing. I used permatex #2 to seal my head bolt threads. Think I would be safe to retorque with that sealant if I choose? thanks
  5. D

    Mercruiser 140 head retorque proper technique

    Hi Scott, Thank you for your reply. I did not consider that! The head gasket I am using is from Felpro part #17200. Are you familiar with this specific gasket? Thank you, Douglas
  6. D

    Mercruiser 140 head retorque proper technique

    Hi, I have a Mercruiser 140 3.0L that has just completed its first 20 hours of the break-in and is now time to retorque the head bolts per manual #10. I was wanting to know if anyone can shed light on the proper method for retorquing the head bolts? Should the engine be cold? Loosen one bolt at...
  7. D

    Mercruiser 140 backfires and pops randomly when accelerating and when above 3000 rpms. Pease Help!

    Mercruiser 140 backfires and pops randomly when accelerating and when above 3000 rpms. Pease Help! I have a freshly rebuilt 1986 Mercruiser 140 4 cylinder engine (new bearings, pistons, bored cylinders, valve job). The mercarb carburetor has been professionally rebuilt by National Carb. I have...
  8. D

    Burnt/melted pistons on brand new rebuilt engine!! Cause?

    Hi everyone. Today has been a very sad and horrifying day. Last summer, I was running my 1986 Mercruiser 140 3.0L WOT when it spun a rod bearing. The engine was already in need of a rebuild then so I invested in doing a complete rebuild. I had the crank turned, cylinders bored over, all new...
  9. D

    Mercruiser 3.0 140 shakes at idle and bogs on acceleration. New Carb?

    Hi everyone. I am a new member to iBoats. I have received invaluable help from this forum in the past while building my project and have decided to join the community. I recently restored a 1986 Glastron 19X ski boat (new deck, stringers, transom, etc.) and just finished rebuilding my engine...
Top