part for "74 351 pleasure craft
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=48125
Printed Date: April-18-2024 at 8:37pm
Topic: part for "74 351 pleasure craft
Posted By: chessie
Subject: part for "74 351 pleasure craft
Date Posted: October-07-2019 at 12:59pm
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I need some new part for 351 . Rear main seal ( right hand rotation ) Manifolds/Risers Drive plate Thanks in Advance for any and all suggestions, Ike |
Replies:
Posted By: Mille1sj
Date Posted: October-11-2019 at 12:21pm
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Checkout Discount inboard Marine. Skidim.com. They have a lot of parts for older PCM engines. Search the forum for other recommendations of where to look as well. Some of the parts are getting harder to find and you may be looking for New Old Stock. |
Posted By: Gary S
Date Posted: October-11-2019 at 12:44pm
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Here is Kens link for a seal- https://www.alexsparts.com/rear-main-seal-marine-reverse-rotation-351w-viton-full-round-one-piece-main-seal/" rel="nofollow - link https://bpi.ebasicpower.com/shop/marine-transmissions-and-parts-borg-warner-velvet-drive-zf-hurth-paragon/borg-warner-velvet-drive-parts/drive-damper-flex-plate-marine-triangular-for-volvo-io-ford-and-gm-120-8-1446" rel="nofollow - Link for damper plate ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: KENO
Date Posted: October-11-2019 at 12:52pm
Don't follow Ken's link for the seal, That's for a 1 piece seal and your 74 would be a 2 piece  FelPro BS40042 works for a rear main seal for your 74. You have wick lines in the crankshaft and a smooth 2 piece seal like this works. |
Gary S wrote:Posted By: Gary S
Date Posted: October-11-2019 at 1:57pm
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Oops. But if it was me I’d have the block machined for a 1 piece anyway..... not a fan of the 2 piece ones. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: MrMcD
Date Posted: October-11-2019 at 4:58pm
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It is more than machining, you would also need a new Crankshaft to go full round. I do not think it is feasible. ------------- |
Posted By: Gary S
Date Posted: October-11-2019 at 5:56pm
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Not what I have heard. Some cranks need to be machined to remove the slinger "ring" that some have,but not all do. The machinist doing the work would know ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: MrMcD
Date Posted: October-11-2019 at 9:16pm
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Did some reading as I am a Chevy guy and weak on the Fords. On the 302 and 351W it is possible to convert the block to accept a one piece seal but you need the conversion done in a machine shop. There is a Youtube video out there showing the necessary machine work. The bare block needs to go into a line bore machine to have the new seal cut into the rear main cap. You are not going to do this in the boat or in your garage unless you have a machine shop. The crankshaft for a 2 piece can be used in a one piece seal engine if you grind off the flange at the rear of the crankshaft or you can use a later one piece crankshaft. Ford used the same diameter seal on one and two piece allowing the conversion. GM did not, the GM one piece is a much larger diameter seal than the GM 2 piece. ------------- |
Posted By: KENO
Date Posted: October-11-2019 at 11:05pm
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So what it really boils down to is You can take your 2 piece seal block and crank and have the block machined for the 1 piece seal and use the original 2 piece seal crank without machining off the lip or slinger or flange or whatever you want to call it. Or you can use any 1 piece seal crank in that old block that's been machined for a 1 piece seal. But if you want to use a 2 piece seal crank in a later block that came from the factory with a 1 piece seal, you have to machine off the lip/slinger/flange so it'll fit in the block because the later 1 piece block and #5 bearing cap don't have the groove that the lip/slinger/flange would fit in. And if you feel like it, you can use a 1 piece seal crank in a 2 piece seal block using the original 2 piece seal. You just won't have that lip/slinger/flange but it still works, you just won't have the wick lines on the crank to help with oil control at the seal. That would be a smooth crank with a smooth seal or a rope seal Gary has that rope seal on smooth crank setup (with a speedi sleeve) if I remember right, but he still has the lip. It's all as clear as the Mississippi during flood season |
Posted By: MrMcD
Date Posted: October-11-2019 at 11:16pm
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Sounds like you have more options with the Ford than the Gm for sure. Thanks Keno, it is now more clear than mud.  ------------- |
Posted By: GottaSki
Date Posted: October-12-2019 at 8:02am
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FelPro makes the 2pc seal thing not scary, ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: 8122pbrainard
Date Posted: October-12-2019 at 9:06am
https://www.bing.com/videos/search?q=installing+felpro+2+piece+seal&qpvt=installing+felpro+2+piece+seal&view=detail&mid=E9F9356AA04C034F6697E9F9356AA04C034F6697&&FORM=VRDGAR" rel="nofollow - Like he's doing here? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: 8122pbrainard
Date Posted: October-12-2019 at 9:09am
https://www.bing.com/videos/search?q=installing+felpro+2+piece+seal&qpvt=installing+felpro+2+piece+seal&view=detail&mid=0F41DC6088DC88B54DF80F41DC6088DC88B54DF8&&FORM=VRDGAR" rel="nofollow - Here's how it's done ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KENO
Date Posted: October-12-2019 at 10:16am
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After a detour through all this seal talk and machining etc, the easiest thing if your crank is in good shape is the 2 piece FelPro BS 40042 seal I mentioned earlier
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Posted By: Gary S
Date Posted: October-12-2019 at 10:47am
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I just don’t like them. If they were so great Ford would never have changed them.There is a fix, there must be a reason that it was developed and personally I’d take advantage of it. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: 8122pbrainard
Date Posted: October-12-2019 at 11:24am
I agree. Any gap in a seal is a potential leak. With a 2 piece, there are 2 gaps! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: KENO
Date Posted: October-12-2019 at 3:14pm
That's an incredible display of brain power right there Pete Does that mean that a 1 piece has 1 gap? I figure that he now has all the info he needs to make up his own mind about what he might want to do, depending on things like his budget etc. |
Posted By: MrMcD
Date Posted: October-12-2019 at 3:41pm
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If you have a full round rear main on your engine and if it is a standard rotation you have the option to buy a Teflon Rear Main Seal. The Teflon rear main seals are the bomb. They take a special installation to avoid damaging them but once in you will never have a rear main leak. They tested to 1,000,000 miles on heavy duty diesel trucks. They are 3 times the cost but I like the never leak potential. Don't try to install one without doing some good reading as they are unique. A plastic protector comes with the seal and is used to slip the seal up and over the crankshaft on install. If you fail to use this the seal will be damaged and leak. They also install clean and dry. No lube on the crank face at all. You do oil the outside diameter with light oil to help the outer seal slip into the block but no oil on the crankshaft seal face or the teflon seal. Teflon will embed into the crank face when it rotates and you end up with teflon rubbing on teflon. They are threaded on the seal face so they will never work on a reverse rotation engine. They have been out now since the late 1980's and are proven many times over. 351W part # from Fel Pro is BS40645, an existing groove on your crank from the factory seal will not affect a Teflon seal so no speedi sleeve is necessary. ------------- |
Posted By: 8122pbrainard
Date Posted: October-12-2019 at 6:18pm
Thanks Ken. Yes, I tried to explain it in a manner I knew you could understand. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: chessie
Date Posted: October-13-2019 at 11:37am
Gee, guys my head is spinning, I’m not even sure which end the main seal is on  Seriously I want to thank everyone for your suggestions and the one piece seal would probably be the best but this is going in my 20’ Southwind which is my second one and will be our Fl. Boat. So, I am going to stay with the two piece seal. I bought this boat for a part boat price or less, I know when it’s finished I’ll have more in it than it’s worth so not adding the cost to the machine the block. I just love old Southwind’s ! I have owned my other for 33 years and have done a lot of foot in’ Thanks again, Ike |
Posted By: KENO
Date Posted: October-13-2019 at 3:47pm
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Well Chessie, glad to see you survived the "discussion". Nobody ever mentioned places to buy the manifolds , but if you're looking for PCM, try SkiDim or E basic Power (same place Gary link for the damper plate) With their discounts in the fall SkiDim might be a better price, maybe |
Posted By: MrMcD
Date Posted: October-14-2019 at 4:15am
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My 1978 Nautique ran 1,500 hours with no rear seal leak. It had the standard 2 piece seal in it. They work fine but the newer stuff is a little better. ------------- |
Posted By: GottaSki
Date Posted: October-14-2019 at 9:33am
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Heh, which end is the red main seal on? Is that like who's burried in Grant's tomb? My first one lasted 37 years and was still dry, second one cost 15 bucks ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |