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General Category => General Discussion => Topic started by: Ambo_bubba on April 03, 2025, 08:45:30 AM

Title: Loop frame oil passages
Post by: Ambo_bubba on April 03, 2025, 08:45:30 AM

Hi all, new here, I'm in the process of rebuilding a 71 ambassador and yesterday thought I was close to completely the engine portion of the restoration. The engine is fully assembled sitting on the bench and as I was installing the oil feed line for the heads, the banjo bolt that screws into the engine block cross threaded and broke inside the block.... After a bit of swearing and general sorrow, I drilled the broken banjo bolt out and installed a helicoil into the block to repair the damaged threads. With that, shavings from the broken bolt removal and helicoil install have made their way down into the block via this oil passage. To be clear, this is the oil port on the block infront of the generator, not on the heads.

Can anyone advise to where this oil passage goes into the block so I can figure out the extent of what I need to clean out before I start tearing thinga apart?

Thanks!

Title: Re: Loop frame oil passages
Post by: Antietam Classic Cycle on April 03, 2025, 09:33:35 AM

Leave the oil line to the heads off, fill the engine with oil and crank it over, oil will flow out that hole and expell any swarf.

Title: Re: Loop frame oil passages
Post by: pehayes on April 03, 2025, 11:45:07 AM

+1
Note that Charlie wrote 'crank' not 'start'.  Its going to be messy, but effective.  Clean up later.

Patrick Hayes
Fremont CA

Title: Re: Loop frame oil passages
Post by: John A on April 03, 2025, 12:19:49 PM

When you retorque the heads after some heat cycles you should check the oil passages in the rocker shafts for any particles since you will have them out anyway.

Title: Re: Loop frame oil passages
Post by: Ambo_bubba on April 03, 2025, 04:08:24 PM

Thanks for the advice all! It will be a very sad day to dump oil all over my recently fully cleaned and shined engine, but oh well, at this point I am very good at cleaning things... :cool:

Title: Re: Loop frame oil passages
Post by: John A on April 03, 2025, 06:48:52 PM

Rinse it off with mineral spirits, it’s cheap and won’t hurt rubber and cured paint

Title: Re: Loop frame oil passages
Post by: EldoEVert on April 04, 2025, 10:54:57 AM

You might be able to come up with a threaded ripple and a piece of hose to direct the spewed oil away from the engine.