Vintage Oldsmobiles Curved Dash, Limited Touring, Models 40, 53, 66; Series 60, 70, 90

303 assembly

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Old Jan 11, 2021 | 09:39 AM
  #1  
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303 assembly

Hi friends and thanks for all the help you’ve given as I replaced the front main seal on my 1949 Olds 88 303 v8. In other posts I’ve asked for help removing the harmonic balancer and removing the timing chain cover. It’s getting close to reassembly and I need some help. My Oldsmobile service manual recommends assembly with some sealers that aren’t around any more.
The 5 bolts on the timing chain cover are suppose to be dipped in “P.O.B. No.3 sealer from DuPont”. Anyone know of a good replacement?
The 4 water pump bolts are suppose to be dipped in “C.P No.9 sealer from National Products Company”. Anyone know of a good replacement?
I plan to use permatex Indian head gasket shellack on one side of the paper gaskets snd Hylomar on the other side before I assemble the timing cover, fuel pump, and oil pan gaskets. How’s that sound?



Last edited by maineolds; Jan 11, 2021 at 09:41 AM.
Old Jan 11, 2021 | 12:46 PM
  #2  
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Oldsdruid
 
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You can use any good modern gas/oil/antifreeze resistant sealer on these bolts. I'm thinking plain old plumbers pipe dope should work fine. The liquid stuff, not teflon tape. Permatex should have a compatible sealant.

Find a local-owned parts store. They'll come closer to knowing what will work than the pimply kid at a chain parts store.

Last edited by rocketraider; Jan 11, 2021 at 12:49 PM.
Old Jan 11, 2021 | 08:28 PM
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Thank you everyone. I had a bit of a setback today. My timing chain cover cracked while removing a brass fitting for the water bypass. Wicked bummer. Thankfully there was a repaired cover on eBay I was able to snap. I sure hope it doesn't leak since all this was to FIX a leak at the front main seal. Hey, look at the bright side, at least its winter and the Olds is resting in the garage!
Old Jan 12, 2021 | 06:45 AM
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Anyone know how to remove the oil fill pipe on the timing cover for a 1949 Olds 88 with 303 v8?
is it pressed in? I need to reuse mine on a replacement cover. I wonder if 1.5” exhaust tubing is a better option? This one doesn’t want to budge.

Old Jan 12, 2021 | 07:10 AM
  #5  
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Hammer, heat and strap wrench success. Thank you for the help. My wallet can’t afford to many more broken parts on this rebuild
Old Jan 12, 2021 | 04:52 PM
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If you have any more unexpected problems I've got a couple extra timing covers with good oil fill tubes. I'm in Oregon, so shipping to Maine might be more than purchase price!

John
Old Jan 12, 2021 | 05:08 PM
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2blu442, mega thanks! Im afraid of the one I just bought on eBay. Im hoping the weld is good and it wont leak. It was fixed near where the oil pan attaches. I bought it afraid I wouldn't be able to track one down. Its expected at the end of the month. Till then the Olds is in pieces. I'll keep you all posted.
Old Jan 21, 2021 | 12:34 PM
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Timing cover is going back on today thanks to all your help. Anyone know the torque spec for the harmonic balancer bolt? I’m snugging it up and don’t see a spec in the book
Old Dec 17, 2021 | 02:04 PM
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I'm not certain you have this 1949 Oldsmobile Service Manual that is found here for the 303 Rocket Engine:
http://edge-op.org/1949_Oldsmobile/index.php?page=0

Your torque specification for the harmonic balancer is taken from this manual and is shown below....Happy Motoring!




Last edited by tnswt; Dec 17, 2021 at 02:06 PM.
Old Dec 17, 2021 | 05:33 PM
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My apologies for hitting on an old thread, but at least we now have a link to the 1949 Rocket engine repair manual....
Old Dec 18, 2021 | 05:12 AM
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Thanks! It’s always good to update info. We’ve all learned a lot from reading old threads. For what it’s worth, the steps I took in the front main seal rebuild worked like the charm. 2000 miles later, all is well.
Old Dec 18, 2021 | 05:38 PM
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You take good car of that Muscle Car, ya hear....
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