Search results

  1. S

    Mercruiser 5.7 EFI Water in Oil

    All, The "crack" i think you are talking about is from the two halves of the casting from manufacturing. steve
  2. S

    Mercruiser 5.7 EFI Water in Oil

    Hello to everyone is helping me solve my issue. I pulled my exhaust elbow for starters because of minerals and such at the joint. Noticed at least one bolt was loose. The gasket surface doesn’t look like a good seal and black exhaust dust appears to be traveling to the water ports. Looked...
  3. S

    Mercruiser 5.7 EFI Water in Oil

    Lou C, understood. But being thicker than gasoline or combustion gases, how does it get pass the rings into the case? What are your thoughts on that? Thank you for your feedback Steve
  4. S

    Mercruiser 5.7 EFI Water in Oil

    Lou C, thank you. I am trying to understand the path if it leaks at the exhaust manifold. So I assume when this happens when the engine is off and water leaks into the cylinder and down past the rings, right? thanks
  5. S

    Mercruiser 5.7 EFI Water in Oil

    Scott06, this engine gets up to operating temp more slowly than my other engine, the difference is several minutes. It has never overheated since I owned for the 7-8 years. Both engines are capable of the exact same rpms at wot. The rpms are at spec for both engines, i don't remember that rpm...
  6. S

    Mercruiser 5.7 EFI Water in Oil

    Alldodge, would you happen to know the compression range for this engine? 120? Thanks sarnone
  7. S

    Mercruiser 5.7 EFI Water in Oil

    Alldodge, for the compression test I need to be back in the water to protect my impeller, correct? And what do I disconnect so it doesn't fire when cranking? Also, for the on engine manifold test, where am I looking for leaks? Inside the exhaust manifold through the elbow connection? Thank you...
  8. S

    Mercruiser 5.7 EFI Water in Oil

    Sorry for the delay. The boat is in freshwater and has always been before I owned it. The risers and manifolds are definitely older than 5 years. I do not use a kit to take up antifreeze. The engines have a 6 point drain system and I pull the hoses to the raw water pump as well. Since my post...
  9. S

    Mercruiser 5.7 EFI Water in Oil

    Sorry for the late reply, my account was locked. I raise the boat above the water, pull the raw water hoses and lay them down, crank it over for a split second to get an remaining water in the pump, remove the 6 cooling drain plugs, then fill the engine with coolant from the large hose at the...
  10. S

    Mercruiser 5.7 EFI Water in Oil

    I apologize for not responding. My account was locked and I could not reply. Engine Serial Nol.: 0L067794 Freshwater Thanks!
  11. S

    Mercruiser 5.7 EFI Water in Oil

    Hello and thank you to whoever reads this post. My starboard engine is a 1998 5.7EFI 260hp with a Bravo III sterndrive. I winterize every year according to the mercruiser manual and add anti-freeze to the cooling system. I do this in my backyard on my hoist, where is stays fully covered for...
  12. S

    Merc 5.7 TBI Stalling Shifting Into Gear

    Hi, I have twin 350 5.7 TBIs with B3s, which stall when shifted into gear. More often when warm and port more than stbd. I also have noticed a drop in rpms when applying throttle just off idle before take off. I have new cap, rotors, wires, iac and tps are newer. Engines have been...
  13. S

    350 5.7 TBI Throttle Cable Issue

    I have an issue with my port engine throttle cable. By the time the throttle handle reaches full swing, it's nearly an inch and a half further than the stbd side but yet is 300 rpms behind the stbd engine. Is the cable stretched or in need of adjustment. Any help is appreciated. Thanks
  14. S

    All gauges on starboard engine are slightly lower compared to port

    Hello, had all VDO gauges that needed replacing on a newly purchased boat. Before replacing I noticed that all the starboard side gauges like oil psi, rpm, temp and trim are all a little lower. I since replaced them all, since the faces were falling off and I still have the same problem. There...
  15. S

    350 5.7 EFIs Lose RPM Under Electrical Load

    Hello, I have a 1998 formula with twin 5.7 medics that are efi. While at idle, if there is an added electrical load like trim or outdrives, both engines lose 100-200 rpms. Let go on the outdrives or tabs and rpms are restored. I also wondered if it was related to engines dying in gear before the...
  16. S

    Recommissioned Merc 5.7s EFI Bravo 3 Die In Gear

    Hello, and thanks for reading. My 1998 Formula 280 ss has 5.7 EFI with Bravo 3s. I had no issues at all before winterization. Engines were muffed and fogged. Upon recomissioning, engines started right up and both revved fine with no stumbling. When I shift into forward or reverse both...
  17. S

    Potential Mechanic Negligence on OMC

    Forum friends, I was recently having some electrical problems with my ignition. I replaced some components and was running fine when it died again. My troubleshooting skills didn't seem up to the task so I let my marina mechanic do the job. Unknown to me, a different guy fixed the problem. I...
  18. S

    Do Audio Systems Cause Ignition System Failure

    Hey folks, I am trying to eliminate the causes of my engine cutting out. The first time I was towed I had no spark at the distributor module. I ran some tests and it appeared to be the coil. So I replaced coil and it seemed to fix the problem. I also replaced plugs at same time. However, I...
  19. S

    How Much Rot Is Too Much Rot?

    Forum, that may be a dumb question. My Four Winns 225 Sundowner began to leak at the transom mount. I inspected with a mirror and light, along with some tapping to determine how much rot is occurring, and discovered some rot starting at the drain and going about 5 or 6 inches above the bottom...
View older results
Top