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    Diagnostic confirmation please

    Mercruiser 5.7 MPI Bravo Serial# 0w377395 Overheating issue. Replaced seawater impeller (was in pieces), replaced thermostat, and back flushed the cooling system (can't find any blockages)....still overheating. With my temp gun I can see that the engine (block, heads, manifolds) are running...
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    Oil in water, but only after shut down

    4.3L Mercruiser (early 90s). This is a replaced long block due to a crack. Engine runs great, but found milky oil after a year of running it. Thought it was water getting in from up top (down from the cover). Changed oil, ran it...no issues. Next day I come out and the oil is milky. No rain, no...
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    Upper steering swivel shaft

    Serial numbers are missing on the transom plate andn not the original outdrive, but Im using 4898730-6225576 serial number range...(260 V8). Steering wheel movement gets to the steering lever assembly, but doesnt relay to the bell housing. Looks like the upper steering swivel is shot...
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    Automatic fuel pump wiring older Mercury

    Hey Boys, Have an older 50 hp Mercury that I can't seem to find a fuel pump kit for so I'm gonna install a low pressure electric. In the past I've just wired a switch on the dash but I'd like to step up my game to something more automatic. What I was thinking was still have a switch wired to...
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    Gekko G3 Key pad conversion to key switch

    Hi there. Working on a 2001 Gekko G3 boat. The keypad for the push button start is broken and I'm putting a regular key switch in. The key pad leads to a control module that also feeds power to the rest of the accessories. What I need is the schematic so I can bypass the module and rewire the...
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    Broken MC-1 Gimbal Housing Repair

    Got a pretty badly broken gimbal housing. In the past I have just replaced the entire transom?but I was wondering what you all thought about the repair kit. I believe the part# is: 18-8311 I've never done one this way, seems like a decent enough alternative. Thanks.
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    Converting to electric fuel pump

    Hi…Just did a block replacement on a 4.3, about a 1990. Does not have the counter balance shaft. The original cracked block had a mechanical fuel pump, the new block doesn't have the hole milled for one so I have to go electric. Obviously it is carb and there is no oil pressure switch to run...
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    Alpha One Gen II Gear Lube Leak Upper Unit

    Hey Guys, Alpha One Gen II leaking out of a hole just about the shift shaft coupler. The drive was leaking previously from the weep hole on the lower unit, did an impeller service and replaced the quad seal...now it's leaking out of the upper unit by the shift shaft.
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    Shift Interrupter Switch/Shift Cable Replacement

    I occasionally have this come up where I have replaced a lower shift cable, test it (on the muffs), then later get reports that the boat is dying in the water once under a load coming in or out of forw/rev. I understand why it's dying on the water under load and not while on the trailer, but...
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    ECM diagnostic...throttle body issue

    Serial #0F452212 5.7L EFI Bravo Three I'm getting no repsonse from the atomizers at the throttle body. To the red wire I get 12v with key on, but no pulse ground to either side (blue or green). I toned out the pin on J2 of the ECM for the pulse ground and with J2 disconnected, manually...
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    4.3L Roller rocker conversion issue

    Putting back together 4.3L Vortec 0L082849 and having an issue with valves remaining open. I'm torquing the rockers down to 16lbs as per the manual. This block did not originally have these heads...the heads are off a 2001 block. Seemingly, the push rods are too long as I am using the originals...
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    6.2L 383ci hammerhead longblock

    I need to find a build-able block to replace an 07' 6.2L 383ci hammerhead. I'd prefer to build it myself vs just buy one built but I'm not as familiar with the different variations of this block...I'm in the look before I leap stage. Is this 383 considered a "stroker"? I guess I'm not...
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    Issues under load 8.2L 415 DPX

    1998 Volvo Penta 8.2L 415-DPX XBYDCE Fresh rebuild, MAP sensor had two broken wires fixed the breaks and replaced the sensor. Was still running like hell, IAC ohm'd out, but the way it was running made it seem like it was stuck so I removed it and it ran like a champ (in a test bucket as there...
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    415DPX timing

    1998 volvo penta 8.2L 502 415DPX XBYDCE Need to know if this engine needs to be put in base timing mode using the shunt. Can't seem to find it in the book, but my diag software gives me a base timing mode option. Thanks.
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    Volvo Penta DPX Flush

    Where the heck are you supposed to hook up water to flush this darn thing? :/ DPX 415 XBYDCE I read that there is a hose on the starboard side of the engine with a blue cap and a water symbol...I'm here to tell you I just rebuilt that engine and handled every hose in the boat and I saw no such...
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    8.2L DPX 502ci Lifter Repair.

    I have this 8.2L 502 that I am swapping the block out on and I just noticed 5 of the hydraulic roller lifters are collapsed (cam, lifters, push-rods, and rockers are all being reused), but I don't recall them being collapsed when I took them out of the engine. No wear to speak of on roller...
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    Testing a newer engine on the ground

    Hey guys....I want to build a stand so I can run newer engines on the ground, just wondering if anyone has any design plans they have engineered and wouldn't mind sharing. For later model motors I have a little stand with just an ignition switch, oil gauge, and tach which I connect using...
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    8.2 DPX Block Replacement

    I've got an 8.2L DPX 415hp with a cracked block and the longblock price is way higher than I expected so I was hoping someone here had some alternative options. All the technical data is posted below. I was wondering if I could go with a 8.1L without running into huge headaches. I've found some...
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    5.0 MPI Alpha Timing

    Serial# OWO33688 MCM 5.0 MPI Alpha Just swapped out the block on this engine, need to make sure I am not missing anything concerning the timing. It's set to TDC and distributor was installed as outlined in the manual with the tang between the two marks. Is that all? No need for base timing...
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    Gear oil in outdrive

    Serial tag is missing on the outdrive so I'm not sure which manual to check to verify if this outdrive is really supposed to have gear oil in it, I thought with these older volvos it's all motor oil. Says 275 on the shift linkage plate. Engine serial says CU 61234 and printed on the valve covers...
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