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  1. D

    How to test tach for accuracy?

    On coil wire you'll get pulses per coil firing, not rpm. The value will be 8x + what you want for true engine rpm Hook the lead to any plug wire. #1 is appropo in the sense you can also check idle/advance timing with the proper tool
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    Mercruiser 5.7 ?

    Gonna guess 4600-4800 I shoot for 4500 most models but some push it up a bit for spec. It should note to the operator on the engine tag, most likely sticker on the rain hat for max wot range
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    How to test tach for accuracy?

    She drives You look Get an advance timing light, they work wonders
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    Replacement long block

    If you're sending the block out pull everything off including the tin Getting a new block shipped to you, just swap what you need from the old to make the new same as old
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    Mercruiser 5.0 MPI #3 cylinder ignition miss

    Replaced just the cap.... Not rotor, plugs, wires or fuel filters I get you dislike the fact you have to perform routine maintenance on your boat. Unfortunately, it is a part of boating. Ya gotta maintain it so you have a baseline. Your boat will fail you at some point, it's inevitable. The...
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    How to test tach for accuracy?

    possible you had the setting wrong on the shop tach an advance timing light has a tachometer setting that i use regularly for troubleshooting
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    Noisy alternator bearing when warm

    Preach
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    MerCruiser 4.3L V6 milkshake oil from cracked intake manifold, how to remove milkshake oil?

    In any case, yeah OP's motor is most likely fubar
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    MerCruiser 4.3L V6 milkshake oil from cracked intake manifold, how to remove milkshake oil?

    Uh....... 101, Lou
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    MerCruiser 4.3L V6 milkshake oil from cracked intake manifold, how to remove milkshake oil?

    Use whatever solvent you like to clean crankcase. Mineral spirits one quart with 4 30 wt oil qts works. Run sound engine on muffs with new filters and oil changes til not too milky. Then let heat soak burn off the rest of the water This is of course you've solved the issue of your water...
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    Can I replace a SX-M1 with a SX-A outdrive, why/why not?

    Ratio in the drive does matter, along with propping, hull design/size, etc... That said, pretty sure you will be able to mate any sx-m drive to your bell housing. Caveat is actual model designation, ratio, prop, etc... You should investigate engine running poorly as more engine related, not...
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    Mercruiser 7.4 Gen V Trim Sender Wiring

    The two male end wires connect to the blue and purple wire female connections at the trim pump wiring harness. The male and female end wires connect to the sender wire ends at the engine harness. Usually located at the aft side of the intake. Look for corresponding male/female bullet connectors...
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    How to do new distributor timing on Mercruiser 7.4 Gen V?

    Yes, if you look close at the casting on the riser mounted module you'll see thunderbolt iv No base setting required. But again.....check total advance to ensure 1. It works 2. It's not beyond 43 degrees at 2500-3000 rpm......
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    How to do new distributor timing on Mercruiser 7.4 Gen V?

    Your 454 doesn't have thunderbolt 5, it's a 4 that has no base timing mode. Someone referenced an mpi style which no 454 came with. Just set the base timing to 8 btdc and you're set. And do check total advance, not a huge deal with the 454. It can handle up to 43ish naturally aspirated with no...
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    How to do new distributor timing on Mercruiser 7.4 Gen V?

    No, the thunderbolt system does not have a computer. Just a sensor and control module. You must set base timing to the factory spec on the engine tag or oem manual for your engine. The advance curve is set in the module but it's good practice to verify full timing advance after setting...
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    2008 Mercruiser 5.0 tks won't go into drive or reverse

    I know how to remove the throttle only button. Trick is to not mar it upon removal, this is why I stock the button
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    Mercruiser 8.2. oil in exhaust

    You can do what you like but you are relying on a failing hose and a non factory plug to contain drive oil. The check valve in the drive is open with the drive installed on the bell housing, therefore an old hose and your plug with 15 psi of pressure under load is all there is to keep oil in the...
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    Mercruiser 8.2. oil in exhaust

    That fitting is a real chore to replace. It installs from the outside but there is a clip on the inside of the gimbal housing that needs to be removed first, along with the gear oil hose from the monitor. Unfortunately you will lose most of the gear lube from the drive if you operate the boat...
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    Two fuel pumps in series??

    Good plan, you should also check fuel pump vacuum. There may be an issue in the fuel system before the pump I've found when people add a "pusher" fuel pump in between the tank and oem filter/pump assembly it's merely masking an easily fixable issue, ymmv
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    Just how long is that resistor wire?

    It's possible it's still the oem harness and the resistor wire is original. You can simply run a new wire bypassing the resistor wire. Just need to get access near the ten pin connector
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