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04-08-2020, 01:24 PM | #1 |
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Join Date: Apr 2016
Posts: 5
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Noisy V-12 startup
Forced home stay is good for something. Finally put the flathead V-12 together enough to start. By no small miracle it started, idles way too fast and makes terrible racket, sounds like more from front of engine. Something is knocking, any wild guesses before I pull the pan?
https://soundcloud.com/user-17353757/20200408-102737a. Gages don't work yet, but seemed to have lots of oil flow from the Melling 15 pump when I turned over with the intake off. Thanks Abe |
04-08-2020, 01:34 PM | #2 |
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Join Date: May 2010
Location: Oregon
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Re: Noisy V-12 startup
Sounds like my air compressor. Better take a close look.
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04-08-2020, 01:37 PM | #3 | |
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Join Date: May 2010
Location: Florida and Penna.
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Re: Noisy V-12 startup
Quote:
it NOW. I had one years ago with oil pressure problems, Ill have to think about it a while. I would put the gauge on, pull the plugs and spin it to see if there is any pressure before doing anything else. Let me know the oil pressure. G.M. Something rings a bell in my weak little brain that the V/12 has hydraulic lifters and when they sit a while they loose oil. It takes a minute or so to get oil pressure to pump up the lifters. They make a lot of noise during that first minute.
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04-08-2020, 02:58 PM | #4 |
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Join Date: May 2010
Location: Mill Valley, Calif.
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Re: Noisy V-12 startup
That sounds exactly like my v8 did when I started it years ago. I shut it off immediately, took the heads off and, I'm embarrassed to say, on one bank of cylinders I forgot the head gasket. The pistons were hitting the heads a slight amount maybe .005. Pan off, check rods, bearings etc. All seemed ok. It's been running fine now for 5000 mi. I hope that isn't your problem. Good luck
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04-08-2020, 04:20 PM | #5 |
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Join Date: May 2010
Location: Alabama
Posts: 3,258
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Re: Noisy V-12 startup
Friends V12 had similar racket . His was the stamped steel pulley on the crankshaft had a couple of spot welds turn lose and when the belt came around it was causing the pulley to open up then snap together. I welded it back in place and it lasted for a while until the pulley finally broke and we replaced it . Remove the Belt and start it up . If it goes away you’ll know .
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04-08-2020, 04:31 PM | #6 |
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Re: Noisy V-12 startup
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Gb
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"you can't make honey out of dog sh*t" "You're a long time looking at the lid" |
04-08-2020, 06:54 PM | #7 |
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Re: Noisy V-12 startup
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04-08-2020, 07:22 PM | #8 |
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Join Date: Jun 2014
Location: Williamsburg, VA
Posts: 1,627
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Re: Noisy V-12 startup
What is the last work you did on the engine? Could be a collapsed lifter or excessive valve lash. Maybe a fuel pump push rod too short, or fuel pump not all the way down on its mount.
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04-08-2020, 07:33 PM | #9 | |
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Re: Noisy V-12 startup
Quote:
every thing. I know it leaked oil at the pan gasket and both valve covers I may remember as I think about it. I can see in my mind some of the things I did but the 90 year memory bank must be getting a little slow or foggy. G.M.
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04-08-2020, 07:42 PM | #10 | |
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Re: Noisy V-12 startup
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04-08-2020, 07:46 PM | #11 | |
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Re: Noisy V-12 startup
Quote:
of time figuring it out. G.M.
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