Ok I am replacing a 1990 330 hp 454 Mark IV Merc./Bravo 1 with a Gen VI motor that is externally balanced. I am sure I need new a flywheel. CanÂ’t seem to find the right pt PN for it. Any one have the part number or a flywheel for that mater? Am I corect in the Mark IV are Internally balanced? Also is the Adapter for the Oil cooler/ remote filter different ( part at the block) different?
thanks
Mike
I Have A Gen 5 Flywheel That In Good Shape 1 Tooth Has A Small Nick In It But Was Never A Problem $25.00 Plus Shipping If You Want It. I Can Email You A Picture Later If You Would Like. Also The Oil Filter (remote Cooler) Adaptor Is Different Than The Mark4 Let Me Know If Interested Thanks Tim
mike, due to the one piece rear main seal on the gen 6 the flexplates are different. Yes on the merc style oil cooler/filter adapt. being different. (at least mine was) on a gen V. I was able to use a couple of adaptors and some AN 12 fittings and line to run my remote setup. The reason I believe the filter pad adaptors are diffrent is that the gen 5-6 have two bypass valves inserted in the pad itself. these can only be found at the GM dealer I found. but I have heard of guys doing a mod to eliminate one or the other. I used the facory bypass valves and see better then 80 psi on start ups and hold 60 psi+ cruising all day long , idle 55 min. using 20-50 oil.
We make the filter pad adapter, Stef's part number 6753, it can be purchased through Rex Marine.
Chris
cstraub69, Is this a cast or billit piece? what needs to be done to use the oil cooler lines on the rail? I was confused about what to block off/change. I read something about the gally plug in the back of the block needs some sort of bypass/restrictor for this. do you know?. Thanks .R.B.
All Mk 4 454's are externally balanced unless changed to internal by a balancing shop and $$$$. True, the Mk 5 & 6 will need different parts tho due to the different crank.
Carlson,
It is a billet piece. One of our pan engineers who is also our main marine pan designer blocks the bypass and then shims the oil pump with .125" on a new Melling M77. That is what he recommends.
Chris
cstraub69, Is this a cast or billit piece? what needs to be done to use the oil cooler lines on the rail? I was confused about what to block off/change. I read something about the gally plug in the back of the block needs some sort of bypass/restrictor for this. do you know?. Thanks .R.B.
yes, if the engine originally had the filter on the block and you are installing a remoter filter there is either a check vlv or bypass vlv(its been awhile!!) that gets installed in the block, above the filter mount, if you need further help let me know, i have 2 gen5, 2 gen 6, and 2 gen 4 sitting in my garage!! all merc, and i also have complete factory merc oil system(adapter,mount and vertical cooler lines etc-your mark4 put the cooler down low, on most gen 5,6 it is mounted on the front of the engine-on the ck vlv or bypass-i don't remember let me know and i will get you a merc part #, charlie
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