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351w reverserotation gaskets |
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ArtCozier 
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Joined: April-25-2012 Location: Orlando FL Status: Offline Points: 1023 |
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 Topic: 351w reverserotation gasketsPosted: March-16-2015 at 12:20pm |
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The change from 2-piece to 1-piece rear main seals on 351W occurred during the PCM 1984 model year. "Somewhere" I have the service bulleting that gave the PCM serial number when the change was put into effect, but "somewhere" remains a mystery.
When 2-piece RH seals became unreasonably expensive, we polished the knurling ("hash marks") off the cranks and used standard seals with no resulting oil leak problems. |
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"Art"
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cueball
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Joined: March-08-2015 Location: Vacaville Status: Offline Points: 78 |
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Posted: March-16-2015 at 9:51am |
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Ordered the gaskets, and some other things...should be here by the end of the week.
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Shawn
1986 SN 2001 |
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cueball
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Posted: March-16-2015 at 2:29am |
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Nevermind...I figured it out, two piece it is.
Once again, Thanks for all the replies! |
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Shawn
1986 SN 2001 |
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cueball
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Posted: March-16-2015 at 1:22am |
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Ok, after a little more research it seems my block is a 75-77. Cast #D4AE-AA
I guess the AA cast #'s makes a difference. http://www.raceabilene.com/kelly/hotrod/engine2.html So how do I tell visually if I need a 2 piece or 1 piece? Yes, TRBenj, I agree, it doesn't sound right with the year gap with the hull year. |
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Shawn
1986 SN 2001 |
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TRBenj
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Posted: March-15-2015 at 11:45pm |
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A '86 boat with an original '74 block? That doesn't sound right.
Either way, if you have a 2-piece block and a RH crank with the wick lines, you should be good. Like TimD said, the seal is bidirectional. |
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Tim D
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Posted: March-15-2015 at 11:41pm |
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Go to NAPA and buy a $14 rear main seal. It will have the same Ford number stamped in it that the "marine" seal will have. Been there, done that 1998.
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Tim D
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cueball
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Posted: March-15-2015 at 11:27pm |
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The engine is original, to the best of my knowledge.
The crank is a RH and has the wicks on it, I checked the cast numbers. I have a new cam for it and it is correct, I even checked it by setting it on top of the block and spun it in the direction it is supose to go and the lobes were correct. |
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Shawn
1986 SN 2001 |
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cueball
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Posted: March-15-2015 at 11:21pm |
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Thanks everyone for the replies,
Yes the numbers are Fel-pro, their website won't recognize the part number, but if you go thur the process to find gaskets for your engine, they come up. Yea, I'm having a hard time finding the rear main seal. I will try the link, Thanks Pete. |
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Shawn
1986 SN 2001 |
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ArtCozier
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Posted: March-15-2015 at 11:13pm |
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The other day I was in the shop where I used to work, saw a couple of RH cranks there. They had light rust, but looked OK otherwise. Do you have the RH cam? They are getting very hard to find.
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"Art"
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TRBenj
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Posted: March-15-2015 at 3:45pm |
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Roller block doesn't add any value unless you plan to go roller!
You're in trouble with a 2-piece block/crank if it's all LH... The RMS isn't an issue as it's bi-directional... The crank has the wick lines machined in and a LH crank can't be spun backwards. You'll need a 2-piece RH crank to use your 74 block. Or, get yourself a 1-piece block and crank to build from. |
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Gary S
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Posted: March-15-2015 at 2:19pm |
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Looks as if he's using a '74 block,all the more reason to look for a roller block
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8122pbrainard
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Posted: March-15-2015 at 10:18am |
Link |
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TRBenj
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Posted: March-15-2015 at 10:03am |
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83+ should be a 1-piece directional seal, the 351 is sti available AFAIK, only the 302 had to be made custom (by Reid).
http://www.skidim.com/prodinfo.asp?number=MAL9-61626 |
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8122pbrainard
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Posted: March-15-2015 at 9:54am |
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Gary,
I went to Felpro without finding them. I must have had one of the jbear computer moments! 
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Gary S
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Posted: March-15-2015 at 9:52am |
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Felpro Pete. He might have problems finding the rear main though.
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8122pbrainard
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Posted: March-15-2015 at 9:27am |
How about links? What manufacturer are these? |
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Gary S
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Posted: March-15-2015 at 8:56am |
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Other than the seals,gaskets don't know which way the engine turns. Just use a quality set
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cueball
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Posted: March-15-2015 at 1:23am |
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Hi Everyone,
I am ready to order a gaskets for my 1986 SN 351w reverse rotation. Block year is a 1974 Heads are a 1975 I know I need the front timming #17795 and the rear main seal #17748 So every kit I find is for standard rotation, #17261, will this work? The only kits I find for reverse rotation is a rebuild kit, comes with bearings etc. which I dont need. Any sugestions? Thanks, Shawn |
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Shawn
1986 SN 2001 |
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TRBenj wrote: