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    350 mag mpi fuel cooler removal help

    Yes last statement definitely worked!
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    350 mag mpi fuel cooler removal help

    Yep pics were big help. Got it off within 5 minutes. Reassembling was a pia as very little room to move in front of engine bay even a struggle getting serpentine belt on. Thanks guys for the replies & help. Great forum.
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    350 mag mpi fuel cooler removal help

    Thanks for the replies the pictures are a great help. No room to get a drill in. The screwdriver trick I have used before on motorcycle fittings & it works. I didn't think it would be that tight & used an eziout but that didn't work just chewed the plastic up. I can't believe mercruiser use such...
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    350 mag mpi fuel cooler removal help

    I need to remove fuel cooler to replace the blue drain plug that has broken off & is filling bilge with water. Common fault I am told. I have removed bracket no 15 in pic but am struggling to remove bracket no 7. I have removed one of the bolts labelled no 8 but can't reach the other one or even...
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    350 Mag Mpi hard to start when warm or hot

    Thanks for that info. I will double check vac at idle for a longer time & wot vac too. Also same with fuel pump but that was brand new 2 years ago. Your last 2 words concern me 'for now'!
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    350 Mag Mpi hard to start when warm or hot

    Sea trial about 40 minutes boat performed perfectly straight on plane without trim tabs down, had to throttle right back to keep her steady at 22 knots. Even after a hard turn she slowed to 17 knots & picked up back to 22 knots without me touching the throttle. However although better she still...
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    350 Mag Mpi hard to start when warm or hot

    Inlet & exhaust lifters stuck up against retaining clip. Soaked them overnight in a new WD40 super penetrating fluid & they fell apart. Cleaned & reassembled them & they are working fine & motor now starts when hot. One tappet was noisy but once engine was warm & an increase in revs it soon...
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    350 Mag Mpi hard to start when warm or hot

    Just to clarify the lifter is all the way down it is the plunger which is not retracting at all it is fully extended against the retaining clip
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    350 Mag Mpi hard to start when warm or hot

    I have definitely done it that way. For some reason the lifters on this cylinder suddenly developed this fault where the valves no longer closed properly - there was no human intervention that did this. There must be a fault with lifter for it to do that surely?
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    350 Mag Mpi hard to start when warm or hot

    I don't think you guys realise I have a problem with a fully extended plunger. I can see the lifters & if it wasn't for the lifter guide I would be able to get them out without removing manifold as when I get a magnet on them the lifter body lifts up until it hits the lifter guide. If you look...
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    350 Mag Mpi hard to start when warm or hot

    If valve is closed with zero lash & before the 1 turn past zero lash there is no up/down movement is that a problem?
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    350 Mag Mpi hard to start when warm or hot

    Thanks that might be issue too. No tdc marker on front of engine & engine is so tight a fit I can't see down there anyway. Have been judging tdc by valve positions maybe I need to review that. Am I right in thinking that when valve is closed some oil drains out of lifter? On the no 1 valves for...
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    350 Mag Mpi hard to start when warm or hot

    Ok thanks Alldodge I will try that again in morning & report back. I had the boat surveyed when I bought it & the compressions were all reported to be in 157 - 170 range.
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    350 Mag Mpi hard to start when warm or hot

    Thanks for reply. I screw rocker nut down until no lash or play. But when I tighten 360 degrees as per manual it opens the valve. Is that correct?
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    350 Mag Mpi hard to start when warm or hot

    Good news but I am a bit confused here might need some help. It was exhaust valve that was stuck open. Exhaust valve on no 7 was not stuck open it was because rocker arm was tight. As soon as I loosened rocker arm off it closed. Did compression test still zero. Noticed no 7 Inlet was slightly...
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    350 Mag Mpi hard to start when warm or hot

    Put my leak down tester on today & I have air coming out of the intake plenum so looks like a fault with the Inlet valve. With my camera I can see valve opening as I rotate engine but it doesn't seem to be seating properly. I can actually see it standing proud at tdc. Can't think what would be...
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    350 Mag Mpi hard to start when warm or hot

    Camera down plug hole bit tricky to decipher at 1st but in the bottom 1/3 of pic is the original cross hatching of the cylinder & valve open on right. In middle of pic you can see outer circumference of piston - no visible damage. The top half of pic I believe is a piston surface that has been...
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    350 Mag Mpi hard to start when warm or hot

    Update 5: diagnostic revealed misfire on cylinder 8. Plug burnt electrode & black. Replaced spark plug now starts when hot. Tech said still a misfire which I couldn't hear until he pointed it out. Compression test revealed only 5 psi on that cylinder so I either have hole in piston, damaged...
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    350 Mag Mpi hard to start when warm or hot

    Thanks just found it in manual will try that before diagnostic test.
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    350 Mag Mpi hard to start when warm or hot

    Interesting I hadn't considered coil. I hope it is something as simple as that. Thanks for reply
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