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Old 06-13-2013, 09:17 PM   #1
Johnnyj
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Default Dry rod bearings

Recently ran a flathead v8 that I was told had been overhauled but never ran in over 20 years. On first run the engine overheated with smoke coming out the breather. Disassembled engine, removed the plugs from front and rear of oil passage and founds blockage in that line.......The rod bearing were dry. Cleaned out, put in new rod bearings and seems like the same problem......no oil getting to rod bearings. The engine is a 1941. The block is going to be vatted and cleaned prior to next build. Any ideas on why oil is not getting to the rod bearings??
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Old 06-13-2013, 09:34 PM   #2
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Default Re: Dry rod bearings

Do you have a pressure gauge and does it register pressure when running?
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Old 06-13-2013, 09:42 PM   #3
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Default Re: Dry rod bearings

Has it been modified for full flow filtration?; this involves putting a plug in oil gallery at rear of engine. If so modified, you'll need to either remove said plug, or plumb in the exterior lines etc to suit.
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Old 06-14-2013, 08:53 PM   #4
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Default Re: Dry rod bearings

There is a plug in the front and rear of the oil tube that runs front to rear of the block
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Old 06-14-2013, 08:56 PM   #5
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Default Re: Dry rod bearings

Yes, 40 lbs pressure
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Old 06-14-2013, 09:07 PM   #6
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Default Re: Dry rod bearings

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If the plug was installed in the horsontal line to the main oil line you would still have oil pressure from the pump but it wouldn't go across to the main line. You have 2 plugs back of the block where to pressure sender unit goes. remove the side one and see if you can stick a screw driver in there about 6in. If it only goes in an inch or so there is a plug in there. I had one of those blocks last year that had the same problem. On mine some one had tried to remove the fuel pump push rod bushing and broke It off and it was blocking the main oil line. Hard thing to find. Walt
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Old 06-14-2013, 11:18 PM   #7
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Default Re: Dry rod bearings

The plug Walt is talking about, would have been fitted, if the engine had a cooler, or a filter fitted. It would likely have another plugged hole above the oil gallery casting boss (which already has a side and top tapping)
Going to Walt's You tube clips on the v8 oiling system might help you.
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Old 06-15-2013, 04:28 PM   #8
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Default Re: Dry rod bearings

Here is a diagram showing the plug in question if modified for full flow. The grub screw would be the problem if not plumbed. Zeke
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Old 06-16-2013, 08:47 AM   #9
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Default Re: Dry rod bearings

Thanks for the info, I'll check the plug out when I see the block later this week
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Old 06-16-2013, 09:13 AM   #10
296 V8
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Default Re: Dry rod bearings

Did you check that the cam shaft bearings are clocked correctly?
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Old 06-16-2013, 10:06 AM   #11
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Default Re: Dry rod bearings

Good question from 296 about cam bearings being indexed correctly. Also, is the front bypass spring and valve in place? Is the fuel pump rod bushing installed??
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Old 06-16-2013, 11:29 PM   #12
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Default Re: Dry rod bearings

The engine ran for a short time and sounded good to me. The bypass spring and valve were in place. When I get the block back ,I'll check the plugs mentioned and hopefully find the problem. The fuel pump bushing was damaged. It was removed and will be replaced when block returns
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Old 06-17-2013, 06:18 AM   #13
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Default Re: Dry rod bearings

If it did have the oil passage plug fitted, the front two main bearings will also have been run dry. (Only the rear main will have received oil). It would be good to give them a good look at too.

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Old 06-17-2013, 07:09 PM   #14
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Default Re: Dry rod bearings

Many thanks for the info., it all helps. I'll let all know what we find.
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