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Old 29-06-2015, 15:14   #1
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Talking Anyone change front main seal on3jh4e ?

Hi all,

Finally got a Dipstick tube issue solved only to start motor to find oil leaking heavily from behind the bottom crank pulley. I'm assuming its the front main seal. Looks like I have plenty of access and am hoping I don't have to pull motor. Anyone done this? After pulling the pulley off, how does the seal come out? Any help on this would be greatly appreciated
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Old 29-06-2015, 15:24   #2
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Re: Anyone change front main seal on3jh4e ?

They make seal pullers but a common screw driver often works. The seal puller has a very agressive hook on the end, kind of like a claw hammer claw but with just one thin hook, so it might fit between a shaft and the seal housing.. Some cases, you drill small holes in the seal housing and then use a slide hammer with a sheet metal screw attachment on the end. Or maybe a pair of vice grips on the screw head..
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Old 29-06-2015, 17:09   #3
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Re: Anyone change front main seal on3jh4e ?

Thanks for the direction. Just found out the oil pump is also in that same location and it may be that leaking. I always assumed an oil pump would be in the pan and would have no exposure to leak outside the motor hmm..
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Old 29-06-2015, 17:42   #4
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Re: Anyone change front main seal on3jh4e ?

Engine model ??
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Old 29-06-2015, 20:45   #5
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Re: Anyone change front main seal on3jh4e ?

2008 3jh4e.
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Old 29-06-2015, 20:51   #6
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Re: Anyone change front main seal on3jh4e ?

you can see the service manual online here:

Boatinfo - Yanmar Service Manual for 3JH4E, 4JH4AE, 4JH4-TE, 4JH4-HTE

and yes, the oil pump is externally mounted behind the crank pulley.
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Old 30-06-2015, 21:55   #7
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Re: Anyone change front main seal on3jh4e ?

Hey, I am having the same issue. Could you let me know what you find? I am thinking the main seal also but also noticed the pump was there too. I think the pulley will be difficult to remove and am on a trip right now so I won't be able to take a crack until I get back. I am assuming I will need to drain they oil and remove the pulley to get access to the seal. Hopefully there is nothing else to remove to get to it.
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Old 01-07-2015, 07:31   #8
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Re: Anyone change front main seal on3jh4e ?

I changed mine and it pulled right out with screwdriver or fingers. Hardest part was getting the pulley off after taking the bolt out. Otherwise a pretty easy job .


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Old 06-07-2015, 18:55   #9
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Re: Anyone change front main seal on3jh4e ?

Thanks for all the info. Looks like I was misinformed regarding the 3JH4E oil capacity. After fixing the broken dipstick tube, I was advised by the original owner the motor took 5 qts. (I don't have any manuals). 5 qts seemed believable so in they went. Dipstick didn't show over full, but was told later by a marine mechanic 5qts was to much and that's why the front seal let go. I keep getting conflicting information about the capacity and cant find anything online. So, here's the dumb question of the month.......Anyone know the capacity ?? 2008/2009 3JH4E.
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Old 06-07-2015, 19:08   #10
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Re: Anyone change front main seal on3jh4e ?

My 3JH2 factory manual gives engine oil as 4.9 litres which equals 5.1777 US quarts. That would be including oil filter capacity.

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Old 06-07-2015, 22:19   #11
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Re: Anyone change front main seal on3jh4e ?

The manual previously linked shows 5-5.5L (+/- 0.3L) depending on transmission type (I suspect really based on installation angle):

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