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Flushing full flow system after bearing failure
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sub-hatchtim
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PostPosted: Sun Nov 28, 2021 8:40 pm    Post subject: Flushing full flow system after bearing failure Reply with quote

Smoked 2 rod bearings today

What's the best procedure to clean out my full flow system

External oil cooler with thermostat
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PostPosted: Sun Nov 28, 2021 9:10 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Your full-flow system include a filter or just the cooler and thermostat?

Max
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sub-hatchtim
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PostPosted: Sun Nov 28, 2021 9:22 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Yes there's a filter, I run wix
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PostPosted: Sun Nov 28, 2021 9:30 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Great. Need to clean everything up-stream of the filter, but everything downstream should be fine.

I would flush the lines and fittings with solvent. Same as when you built the engine to begin with.

Check the pump for damage.

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PostPosted: Sun Nov 28, 2021 9:39 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Get an electric pump and a bucket
https://bergmannvw.net/Website-New/pages/Engines/engines_accessories-oil_cooler_kits.html
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PostPosted: Mon Nov 29, 2021 7:49 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

sub-hatchtim wrote:
Smoked 2 rod bearings today.


Did you determine what caused this????
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PostPosted: Mon Nov 29, 2021 7:54 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Years ago I had an aluminum rocker get chewed up. I filled the engine with kerosene and ran it for a few seconds and the drained it. I did this 3 times then filled with oil and drive it 30,000 miles before it eat a valve.
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sub-hatchtim
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PostPosted: Mon Nov 29, 2021 8:44 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Cusser wrote:
sub-hatchtim wrote:
Smoked 2 rod bearings today.


Did you determine what caused this????



I haven't

Was driving around 25 mph didn't even make it out of my neighborhood

Oil light came on, coasted into a parking lot, could hear some engine clatter, shut it down

#1 and #4 rod bearings are gone, the journals on the crank have light scoring and the oil passages are crammed full of bearing material

The cam, main bearings and 2 and 4 rod bearings look fantastic

92x69
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PostPosted: Mon Nov 29, 2021 9:13 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

I'd be curious about the crank style and center main bearing style. Rod #1 and #4 are both fed from the center main, and rod #2 and #3 each get to enjoy their own personal main bearing source for oil.

I tore down 8 cores recently, all slightly modified/rebuilt at one time, and 6 of the 8 had visibly pronounced wear on the #1 and #4 compared to everything else.
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sub-hatchtim
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PostPosted: Mon Nov 29, 2021 9:44 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Other than full flowed it was a stock bottom end


jimmyhoffa wrote:
I'd be curious about the crank style and center main bearing style. #1 and #4 are both fed from the center main, and #2 and #3 each get to enjoy their own personal main bearing source for oil.

I tore down 8 cores recently, all slightly modified/rebuilt at one time, and 6 of the 8 had visibly pronounced wear on the #1 and #4 compared to everything else.

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PostPosted: Mon Nov 29, 2021 9:53 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Anywhere that may have had debris needs to be cleaned with solvent and a brush, rinsing or flushing never gets what a brush will. Thankfully, the filter should have protected everything between it and the bearings.
But you really have to wonder about the cause of this failure. How many hours on this motor?
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PostPosted: Mon Nov 29, 2021 10:10 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Around 6k miles in my westy
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PostPosted: Mon Nov 29, 2021 10:27 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Did you check to make sure the oil feed hole in the bearing saddle was fully uncovered? It sounds to me like it might have been partially blocked by the bearing and starved the rod bearings.

You can usually see the witness mark on the backside of the used bearing half.

Post some pictures of the oil feed hole in the center main on the crank, and also the center main bearings. I am also interested in which combo of crank/bearings you used.

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PostPosted: Mon Nov 29, 2021 10:32 am    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

I'll snap some pics this afternoon

This engine was assembled by a local engine builder




Brian_e wrote:
Did you check to make sure the oil feed hole in the bearing saddle was fully uncovered? It sounds to me like it might have been partially blocked by the bearing and starved the rod bearings.

You can usually see the witness mark on the backside of the used bearing half.

Post some pictures of the oil feed hole in the center main on the crank, and also the center main bearings. I am also interested in which combo of crank/bearings you used.

Brian

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PostPosted: Mon Nov 29, 2021 5:23 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

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PostPosted: Mon Nov 29, 2021 5:25 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

One thing I found odd during tear down, when I pulled the dog house cooler and stand not a single drop of oil came out
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PostPosted: Mon Nov 29, 2021 5:59 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

sub-hatchtim wrote:
One thing I found odd during tear down, when I pulled the dog house cooler and stand not a single drop of oil came out

Normal. The oil drains out when the engine stops.

Max
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PostPosted: Mon Nov 29, 2021 6:06 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Max Welton wrote:
sub-hatchtim wrote:
One thing I found odd during tear down, when I pulled the dog house cooler and stand not a single drop of oil came out

Normal. The oil drains out when the engine stops.

Max


not a single drop??

ive torn down a few engines that have been sitting for 20 plus years. oil came out of all the coolers. even the ones without oil in the sump. both early and late coolers.
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PostPosted: Mon Nov 29, 2021 6:14 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Chickensoup wrote:
Max Welton wrote:
sub-hatchtim wrote:
One thing I found odd during tear down, when I pulled the dog house cooler and stand not a single drop of oil came out

Normal. The oil drains out when the engine stops.

Max


not a single drop??

ive torn down a few engines that have been sitting for 20 plus years. oil came out of all the coolers. even the ones without oil in the sump. both early and late coolers.

My experience is different.

Then again, maybe we just discovered what killed his engine.

Hey sub-hatchtim, was there any oil in the engine when you tore it down?

Max
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PostPosted: Mon Nov 29, 2021 6:27 pm    Post subject: Re: Flushing full flow system after bearing failure Reply with quote

Yes and I had just checked the oil
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