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    Miss firing Merc 7.4 mpi L29 2000 2855 Ciera SB

    Your system does not operate on open or closed loop. That is for emissions controlled (catalyst) engines. FYI a catalyst system starts and warms up in open loop then changes to closed loop for normal operation. Saying "comes off closed loop" makes no sense, this would only happen if there were...
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    Engine swap, OMC to mercruiser

    Best option is to install an entire mercruiser package. Engine, transom assy, drive and controls/cables/wiring Nothing from mercruiser will match up with OMC
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    The easy way to install Alpha One/Gen1 bellows

    Your process is not easy. Way too much going on there. Always install u joint bellows to bell housing first, along with water passage hose and shift cable. Only item installed to gimble housing first is the exhaust bellows
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    1999 4.3 Gi no spark from coil & low voltage to fuel pumps

    Depends on if is MPI, TBI may not use cps
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    SPN 4236 FMI 1 troubleshoot

    probably on the right track with the O2 sensor, no idea which is bank 1 or 2. maybe google search for answer? i've only used diacom for volvo diag, can't comment on what you're using however one test that comes to mind is swapping the O2 sensors from one side to the other, see if fault reads...
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    1999 4.3 Gi no spark from coil & low voltage to fuel pumps

    first guess would be crank position sensor does the tach register anything during cranking?
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    Ran outdrive without lube! Bad sound.

    Yeah, agree that gear oil should be replaced immediately upon service but have a hard time seeing the logic in condensation due to the fact the drive is a sealed unit. Have left many drives empty due to faulty seals needing repair at a later date which have sat for months empty, zero rust on any...
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    Carb rebuild kit

    You need to know the carb number stamped into the air horn on the carb, that will give you the proper info for ordering a kit. FYI, you can order the proper marine kit from holley or order it through a local parts supplier, no need to get from Volvo
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    Ran outdrive without lube! Bad sound.

    Why?
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    4.3 merc water in #5 cylinder

    Even less than half, is around 12 lb/ft iirc. With a proper sequence and multiple passes with slightly increasing torque. Also, even though not recommended I use a gasket sealant around the water passages on both the heads and intake manifold
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    Alpha 1 gen 2 5.7L overheating

    Seems like he's recommendingthe test Rick mentioned should be performed with the boat in the water, not running on muffs. Based on your first post, even running on muffs you should have better flow than you describe. As others have mentioned, the issue is either a faulty impeller/sea water...
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    Volvo AQ225 dipstick crossover

    You might get lucky with a truck tube and stick but often they are routed different. You may be better off buying a used stick that fits the tube, cutting it and marking it yourself
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    Raw water flow

    Once engine is running warm at idle with choke open you want to see pretty much the same amount of water exiting the exhaust as what is going in. The exhaust is an open ended system with constant flow, the only cooling water that isn't continually exiting is what is in the engine block. Once the...
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    Mercruiser 7.4 mpi

    Possible need to change one or both regulators, you can try testing as described to ensure the pump is good, i.e. can produce the proper pressure. IME the pump should produce upwards of 80 psi hence the need for regulator(s). Most times the regulator(s) fail causing excess pressure and a rich...
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    How to drain tilt-trim system

    Aft = furthest back, opposite of forward. So, the connections furthest from the transom
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    Won't idle

    When was the last full tune up performed? Any warning horn/fault data retrieved? Does the engine start and idle when cold? Is this TBI or MPI?
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    3L GLP-E Carb setup

    Would guess the info is the same for both engines, being of similar vintage and the 3 liter not changing much over the past fifty years. This is a holley 2bbl? For float height I would measure the existing and set new one to that. Idle speed would be approx 600- 700 in gear on the water. Idle...
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    How to drain tilt-trim system

    With the drive fully down/in remove the hoses from the aft connections on the trim rams. Have a helper run the pump from the remote handle while you collect the oil in a pan from the hose ends. Once the oil is out you can flush the system with new oil until it comes out clean, reattach the...
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    Mercruiser 4.3…Milky oil coming from timing cover.

    Not going to prove you wrong, because you are not. I will share an experiment I performed several years ago. During winterizing I chose four 4.3 engines with intake drain plugs, two Volvo, two mercruisers. The first mercruiser I opened the intake drain first, water gushed out, maybe a pint or...
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    Exhaust Manifold bolts

    Those exhaust ports look nasty and the valve seats are most likely toast. Water in the combustion chamber causes severe damage in a short time. Based on the photos it appears this is a salt water engine? As Lou stated a valve job is most likely required at a minimum, would think there is...
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