Author Topic: Stupid Question  (Read 2124 times)

Tim175

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Stupid Question
« on: January 01, 2010, 05:52:34 PM »
Ok so im assembling my 351c. However when i was at the machine shop yesterday picking up my parts i was stupid enough to leave with out picking up oil or assembly lube for the main bearings etc. Seeing as today is new years the machine shop is closed along with most places that would sell what i need. So my question is: can i just use some motor oil i have in the garage cabinets for the main and connecting rod bearings or is that not safe? Thanks.

Konrad

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Re: Stupid Question
« Reply #1 on: January 01, 2010, 05:55:18 PM »
I haven't rebuilt an engine myself, but I am pretty sure that it HAS to be assembly lube.

Tim175

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Re: Stupid Question
« Reply #2 on: January 01, 2010, 06:00:16 PM »
Not what i wanted to hear ;D
Thanks for the reply

Konrad

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Re: Stupid Question
« Reply #3 on: January 01, 2010, 06:05:54 PM »
yeah I know, perfect day to get her done. Pretty sure assembly lube is think and stays where it's supposed to whereas oil will drip out and not stay there and it can take a bit for the oil to get everywhere on startup. Have you ever let an oil drain pan sit on an angle and all the oil will pool up in a corner? After a few days of that, there is almost no oil anywhere else because it all slowly drains down.

Soaring

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Re: Stupid Question
« Reply #4 on: January 01, 2010, 09:12:11 PM »
I have rebuilt a few engines by wiping some grease on the bearings and started it up with 30 weight oil without a problem.  Just make sure the bearings are greased. 

holdover

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Re: Stupid Question
« Reply #5 on: January 02, 2010, 10:17:47 AM »
40 years ago there was no "assembly lube"(except that supplied by crane, isky etc for the cam) and motors worked just fine after starting up. I would use it if I had it, but wouldn't let it stop me from doing something. Use a quality oil and coat all the moving parts.. I also fill the oil filter if it is in a position that you can before I crank the engine, I also do not place the coil wire until I have oil pressure and usually leave the spark plugs out so it turns easier while getting oil pressure the first time. Don't know your experience, so I'll mention that most engines drive the oil pump with the distributor, so it has to be in place before you try to get some oil pressure. I always check clearences when assembling.

Soaring

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Re: Stupid Question
« Reply #6 on: January 02, 2010, 05:22:06 PM »
I agree. 

BlackShadow

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Re: Stupid Question
« Reply #7 on: January 02, 2010, 11:39:58 PM »
First off I agree with holdover too and to added to what he has stated we have also used stp to lube  the bearing at assembly.

Konrad

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Re: Stupid Question
« Reply #8 on: January 03, 2010, 01:48:39 AM »
Sorry I guess I was wrong. I prefer to err on the side of caution. Oil just didn't seem like something that would stay put.

Tim175

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Re: Stupid Question
« Reply #9 on: January 03, 2010, 02:11:02 AM »
Thanks for all the input guys i appreciate it. I just went ahead and waited until this morning and got some assembly lube and put together the bottom end. I'm sure i could have gotten away with just using oil but i did not want to take any chances after spending as much as i did for this damn thing haha. I just can't wait for it to be finished!

jethat

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Re: Stupid Question
« Reply #10 on: January 07, 2010, 12:56:55 AM »
I like to take a socket and put it on the oil pump drive shaft and prime the oil system before I put the distributor on. I've done that with the 3 new engines I've installed works great. I use an air ratchet. Cant remember what size the shat is around 5/16 I think but its been so long I cant remember.I let it spin for a couple minutes..

Jeff73Mach1

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Re: Stupid Question
« Reply #11 on: January 07, 2010, 07:55:39 AM »
prime it with the valve covers off until you see oil coming up through the pushrods (unless you have solid lifters)

 

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