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    About to go insane about my 470!!

    Make sure the gasket thickness at fuel pump mounting surface is the same as what was removed. If you aren’t sure, use a mercruiser gasket, that should have the correct thickness. Best thing is to check the fuel pressure if you can Also this could be mechanical advance related, clean that up if...
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    Mercruiser 470 runs rough after 15 Minutes

    Thanks, I’ve checked it as engine is warming up and when I’ve had the problem I pulled the flame arrestor and it was open.
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    Mercruiser 470 runs rough after 15 Minutes

    Just an update, there was no filter on the fuel suction tube, but the tube appeared clean with no debris. I tried the timing light, but couldn’t find anything conclusive when the problem would occur. With the engine running, I checked my voltages again in the low tension coil circuit, I was only...
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    Mercruiser 470 runs rough after 15 Minutes

    Great ideas, thanks! I just bypassed the resistive wire with a resistor and there was no change. I’ll double check with a voltmeter as suggested and I think I’ll try to start it with the starting wire to the coil removed, then run it and see if that changes anything I’ll try the timing light as...
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    Mercruiser 470 runs rough after 15 Minutes

    I have a 1985 Searay with an I/O 470, mercruiser 2bbl (170). I installed a SEI 106 out drive about 20 hours ago, last November. The boat start and runs well cold or warm. It accelerates smoothly and idles just fine, shifting seems to working well. After about 15 to 20 minutes at cruising speed...
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    Brain fart while removing Alpha drive

    On or off the drive needs to be in forward so the the shift shaft will slide in or out of the shoe in the bell housing. You may have gotten lucky. it’s easy to have a brain fart in the heat of battle, I’ve come close to making that mistake myself.
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    The whole project took me around 25 hours including the removal and installation of the stern drive unit. It was actually kind of a fun project, but you need some time to do it. Someone suggested about 4 hours on a previous thread, no way! Also don’t forget to use a drop of high strength...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    I changed both drain plugs on the heat exchanger since they were easy to get at and I had the coolant drain out anyway. I put them in and the lowered the engine to the starting position with the adjusting stud. I put the lower nut and jam nut back on, leaving them loose until I checked the...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    I put the hose connector cover on and torqued it to fifteen lbs and cracked the cover in the process. Fortunately I had another cover that came with the impeller cover I got on eBay, so after another gasket cleaning drill I put this one on and just tightened it to what felt right and it hasn’t...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    I ordered a gasket kit from Mercury prior to starting this and I used Permatex Aviation gasket instead of perfect seal on all the mating surfaces as I believe others have done. My timing cover went on easily, I tried to be careful to get it on evenly. Once it was in place the cam seals appeared...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    My chain tensioner was worn pretty bad so I replaced it with a less worn one I found on eBay. The timing chain and gears seemed other were in good shape. The exposed oil pan gasket was fairly intact and there was no gasket material on the timing cover, so I was more fortunate than others as far...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    As far as the camshaft is concerned, I found the same deep groove under the front water seal as others have documented, and similar light groove where the rear water seal rode. I used a micrometer to measure the camshaft and came up with .873 and some change as have others, the low end of the...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    I used a hammer and punch to remove the water seals and a hammer and PVC coupling to remove the front (oil) seal. I used a hammer and a device that was just slightly less than the diameter of the water seal cavity to install the water seals. I could not find a PVC piece close enough to the...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    I’m going to try to capture all of the concerns pressing the seals in and out I came across in the various threads on this forum, that way there in one place. The timing cover has a lip on the back where the rear water seal seats. So the water seals can only be pressed or punched out one way...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    I removed the timing cover and took a picture of the position of the cam seals. I wanted to duplicate this, particularly the front seal, when I installed the new seals so I could be certain they would be positioned over the speedy sleeve. My front seal is located at the base of the chamfer in...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    I removed seven screws from the oil pan gasket, three go into the the timing cover and I removed two on either side to try to make separating the oil pan gasket from the timing cover easier. I don’t think it helped much. I worked the razor blade between the timing cover and oil pan gasket as...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    I had no issues removing the stator Allen screw s. I have an alternator, so I simply set the stator aside and did not reinstall it. My impeller was also easy to remove, I heated it first to break any locktite that might have been there and it came right off. My water pump cover came off in two...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    Like others doing this repair I struggled with how much room I would need to pull the harmonic balancer forward even after I raised the center of the crankshaft high enough to get the puller on. As it turns out, the harmonic balancer only moves 2 1/4” forward before it clears the crankshaft, so...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    Before I started this project I noticed all of the available information addressed raising the engine with a hoist if the center of the crankshaft was below the deck. A hoist isn’t necessary if you can raise the motor high enough using the alignment adjusting stud. You first must remove the...
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    Mercruiser 470 Cam Seals 1985 Sea Ray Monaco 185

    This thread is an update of numerous threads, some more than ten years old with a wealth of information on replacing the cam seals in the veritable 470 engine, some of which may still be around. I added a little of my own insight and experience, but I owe a debt of thanks to all those posters...
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