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    5.0 Thunderbolt does it have a pcv valve or is it hollow?

    This 1984 350GM motor with thunderbolt ignition has no PCV valve that I noticed. It does have 2 breather hoses from valve cover to the top carb cover
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    Owner ordered a Sierra CW starter 18-5907 from Amazon. https://www.amazon.com/Sierra-International-18-5907-Reman-Starter/dp/B0000BYOAH which is $60 less than the local marina wants. I did find an $80 cheaper one...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    Yes pump orientation does that, can change input rotation to match engine rotation, otherwise you have no oil pressure in the trans and it wont even work, no clutch pressure. Velvet drives with gear reduction units can also reverse output spin from engine spin, or keep it the same direction, it...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    No, likely wont bother. engine is confirmed turning the wrong way, as in LH when needs to be RH. I don't want to do extra work. Plus it explains why when I removed some pugs, they were totally dry and clean, even after spraying in start fluid and a little extra gas. The intake manifold blew the...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    I found out some ratio velvet drives change engine rotation to the prop. 1.88 to 1.81 gear reduction units do that. Input is RH, and output is LH the engine must be a RH reverse rotation as the distributor cannot turn CCW cause the oil pump driven by the distributor wont pump any oil. RH and LH...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    Does this mean the firing order is then https://www.crankshaftcoalition.com/wiki/GM_firing_orders 1-2-7-5-6-3-4-8 since it is a RH reverse rotation motor
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    Which way does a Mercruiser MIE 260 distributor spin?

    yes, distributor must turn CW or the oil pump wont pump oil. I finally realized all that, thanks for the help. He needs a new starter. I dont know what part number he got from Dare Marina, just that it spins the wrong way. They had looked the boat up and still sold him the wrong one. Parts...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    I realized the situation is pretty definitive, the distributor turns the oil pump, distributor then MUST turn CW or the oil pump wont pump oil. So he has the wrong rotation starter installed. The Velvet drives 1.88-1.91 gear reduction units spin the output prop shaft opposite engine rotation. So...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    of course, they are inboard. How about distributor rotation?
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    Parts list for starters on this engine mention LH and RH starters. Meaning Distributor would have to turn either CCW or CW depending on which starter is used. Unless the blocks differ among mie 260 motors. Dont get why they would list LH and RH starters, if all GM distributors turn the same CW...
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    Which way does a Mercruiser MIE 260 distributor spin?

    Parts list for starters on this engine mention LH and RH starters. Meaning Distributor would have to turn either CCW or CW depending on which starter is used. https://www.marineengine.com/parts/mercruiser-sterndrive-parts/260-mie-gm-350-v8-19811986/5907058-thru-0b522505/starter-and-alternator
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    Which way does a Mercruiser MIE 260 distributor spin?

    Well this one spins CCW and starter was replaced, and it wont fire up. Must mean the wrong rotation starter is spinning engine the wrong way? Slipmate I am helping with his engine got the starter from Dare Marina, and they said its the right one. So maybe the parts guy screwed up?
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    I did try switching wires around, BUT, big but, no one had messed with the spark plug wires, or distributor timing and it refused to fire up, so none of that made any sense me changing things around. The Rotor is most definitely turning CCW on this engine, a GM 350 Mercruiser MIE 260, and if it...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    What about the distibutor rotation, everything I see online has it turning CW, this one is turning CCW. The starter was replaced as it burned out when he flooded the engine. Maybe it is wrong rotation starter? Starter gear drive faces bow, brush end faces stern, and it mounts behind the engine...
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    Which way does a Mercruiser MIE 260 distributor spin?

    Guy I am helping changed starter. The distributor turns CCW right now, and motor turns CW when standing in front of the engine pulleys. Engine is on the PORT (left) side in the boat made in 1984 This is the distributor...
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    Will check the compression in a few days. It has electronic ignition, no points. So is this a standard rotation engine? Distributor turns CCW
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    1984 Mercruiser GM 350 engine no start, not even trying to fire

    Beginning to wonder if valves are stuck open. Engine is portside, so should be standard rotation. Distributor turns CCW, is that correct? And what is the firing order? 1-8-4-3-6-5-7-2 ? What is compression range for GM 350 MCIE 260 Mercruiser? What is the spark timing? I pulled wires and took...
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    MerCruiser 260 Flame arrestor fitment with a bracket?

    Spent time on this engine today solving a quadrajet carb that refused to stop flooding, the float was jambing against the tower, had to spread the arms wider, not it is solved. What a pain. It also has a jambing accelerator pump, it sticks in the down position. We put in a new one it still...
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    Carburetor Issues, Dripping Carbs...

    Mechanical pumps limit their fuel pump pressure by the spring that forces the diaphragm closed. Really they dont over pressurize the fuel simply by the way they are made. Electric pumps that spin may over pressurize the fuel.
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