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    454 Rebuild or done...?

    Circa 2000 454 Marine Power Vortec 330 HP with 960 light hours. Engine had run well this past Summer, then some vibration and was laggy, did not push the RPM due to the lag and vibration. Starts were hard and substantial cloud of what I call steam or white smoke that would dissipate after...
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    454 running rough - vibration - new crank pump?

    Had a new Johnson sea water pump installed. My next trip the engine seemed to lag and could feel some vibration. Throttling up seems to increase the vibration. Engine is not 'smooth' at 3250 the typical cruise she likes. My first thought was a bad plug, needs a tune up, haven't done that yet...
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    454 belt squeaky / weak start up

    Squeaks on start up, intensity declines after warm-up but still present, intermittently. Also have a lame start up at times. Do not think they are related but...? All gauge functions operating normal range, hitting RPMS and cruise is spot on. Belt needs adjustment? I have a 2 hour run coming up...
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    350 XL 1997 ...motor mounts on center?

    Does anyone happen to know the mounting bolt dimensions? I'm looking at a replacement engine bolting on 23.50" on center. Was hoping this may line up? I'm taking a hard look at replacing my 270's with the Marine Power 5.7 MPI/FWC 292 hp rated. They have a Left and Right available, no catalytic...
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    Sherwood P 1014 failure again Crusader 350

    Had both my raw water pumps replaced 2 years ago twin Crusader 350 circa 1997, this fall late season on my way to haul out Starboard 'failed' and was replaced...haven't run it yet (slow to get off the hard). Overheat/alarmed and shut down and limped back. Mechanic just called in a failure on...
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    High temp alarm and coolant blow...?

    Engines have run at temp all season after new riser job and sea water pump job 350 XL 270 1997. Cruising at 3200 for about 45 minutes suddenly got a high temp alarm on starboard side, temp gauge spiked hot, pulled back/safety mode and shut down. I did launch off a couple of steep waves and...
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    350 XL high pitched squeal on start up...?

    Had a recent water/pump belt job. New squeal on 6 cranks in a row last trip. Not on cold start up, this happens after running some and shutting down to drift. The new belt has maybe 10 hours on it. Mechanic said new belt probably needs adjustment? Legit ? Have new risers as well, cant see...
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    350 XL overheat and knocking...?

    Just underway today. Port side ran up to 220 and alarmed. I limped back at low rpm a short distance. In the slip in idle I revved it up slightly and it alarmed again. Pulled the hatch and heard a distinct knocking. Shut her down. Couple observations: Heat eX seemed very cool to touch. Odd...
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    1997 350XL TBI raw water pump...risers...?

    I have replaced the impellers on a regular basis. Risers and elbows are coming up on 4 seasons. Hours 780 +/- on the engines. Recent slight steaming on one side, one riser and hose seems a little warmer, but no high temps. Fresh water cooled engines in salt water use. Heat Xchangers and TBI...
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    DF 90 low power...?

    Engine is running rough and knocking. I can hear a slight ticking noise. Won't plane up....about 1/3 power with Max throttle. Kids overloaded the boat today and tubed.... Last time I had a similar problem on a Merc it was a power head failure. I can run it slowly. My mechanic is across the...
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    Oil analysis high silicon level ?

    350 TB using 15w40 Rotella. Lab analysis showed high silicon level. All other levels in line. What would the cause be? Any major concern? Gasket ? Thanks.
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    1997 350 TBI white steam...and temp warm...?

    Port engine 'alarmed' and went into safety mode the other trip while cruising at 3250. I saw the temp gauge spike hot when this happened. Slow cruise back at 1500 temp ok. no more spike. Serviced new impellers went in. Strainers checked and intake pick up appears clear. Went fishing, port ran...
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    20w 50 Oil add ZDDP ?

    Mechanic (in Florida) suggested this for 1997 350 XL ? He changed my plugs etc when I was south. I am in the NJ/NY area and fish late into the Fall season. So it's 98* then 38*. I also read 15W 40 being the Crusader spec for this engine on another forum? Which of these is the best match ...
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    1997 350 TB crankcase moisture venting...?

    Back on the board for some help....troubleshoot this please: Twins Hours 770, new risers 2 years ago, ignition coils, distributor kits. Had a tech with solid reputation do some evaluating for warm port engine, but not overheating. This engine runs well generally. Determined on test run that the...
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    350 XL (1997) alarm/safe mode....?

    My engines have run well this season so far.....ran about 38 miles off and my starboard alarm goes off ( 3250 rpm ) and the engine started to cut back so I pulled the throttles back and at about 2000 rpm the alarm quit. All gauges read normal, checked levels all ok. Trolled for a while thinking...
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    Ignition Control Module....keeps blowing.....?

    350XL 1996 TB....lost power underway 3 weeks ago, came back and replaced Ignition Module all good. While underway yesterday same thing same engine, limped home. Cant start etc. My mechanic replaced it again this morning, ran out and trolled for several hours. All good, then noticed a slight...
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    Exhaust sheen in discharge FWC 350 ?

    One engine 350TBXL has a bit of smoke on start up and while at idle, my other engine is clean. This same engine also has had periodic discharge sheen which seems to be increasing....( could be paranoia) We went to synthetic oil last year which made some improvement. Both engines are smooth...
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    350 XL running hot...?

    350 TBI with FWC. New thermostat and impeller last fall. This engine has never run hot for me. New risers last fall as well. Climbed up to 200*+ and alarm went off. This occurred in the slip after it warmed up. Typically this engine runs at no more than 180* and usually less. I have never seen...
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    RPM gauge flutter ?

    RPM Port gauge bouncing up and down. Engine seems to be smooth and not missing. What would be the source of this, gauge is pretty new this winter.
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    1997 TBI 350 gremlin

    Despite new plugs, wires, cap, rotors, oil change etc. I have an intermittent 'no spark' . The engine may start and run and then not start again within minutes or hours, or start again soon and then not....it has not stalled out yet while underway. Its not the starter which cranks. It wont fire...
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