How big is the risk to use this bearings ? [std ]

[germanmichel]

Hello all,

I would like to change preventative my crankshaft and rod bearing shells.
Currently I have to order some parts at AH spares (UK) ,I would like to use the offered approx. 39 Pound bearings also from AH spares.
For information the crankshaft is in good condition and I would like change in new std. size bearings with out grinding the crankshaft.....I know it is quick and dirty...
I asked them ...(thats the right word ?) who is the supplier of the bearing shells ? The answer was : KING bearings produced in Israel.

https://www.kingbearings.com/corpdesc.html

https://www.king-bearings.com/cat/html/models.htm (see Austin)


Original there are vandervell bearing on place.


I would like to know your OPINIONS. Can I use that or not ?


Bye michel- who has some concerns

 

[dancrim]

If it were me, considering the crank surface is in good condition, no scoring and the berrings are not scored, I
would use plastigauge to check clearances. If OK I see no
reason to change berrings. If out of Spec. I have not had much luck with AH Spares products. Moss motors may have a different supplier.

 

[TimK]

I totally agree with using plastigage to check clearances. Especially if you get new bearings. I would not change the bearings if they are not scored or unevenly worn and the clearance is in spec. If you don't know about plastigage, check this link:

https://www.ehow.com/how_2142943_use-plastigage-measure-clearances.html

 

[Randy Forbes]

Plastigauge:

About $1.00 USD per 12" length. The "green" color is for .001-.003" clearance, and then there's "red" and "blue" fopr checking wider gaps.

 

[TimK]

Nice photo spread, Randy...

 

[smaceng]

Coming from the little AH side, King bearing is considered by one of the most knowledgeable in the field, Hap, as good as or better than Vandervell bearing that our cars originally had. I believe that is what he uses.
Scott in CA

 

[germanmichel]

guys,
your answers are very cool
As always an overnight support !

randy your pics explanation is excellent.

But I know the procedure with the plastigage.
In my case I think, it makes no sense to measure the clearance because the bottom side shells are worn (direction to the sump) This is nothing to discuss, I have to change it in new one.
See the picture . The soft lead indium layer is partially removed and you can see the copper layer. But the inner surface is absolutely smooth.The oil pressure was very good.

( I dont`t know something is wrong with the directlink)

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I know the previous owner has replace the pistons, so I found yesterday that the rod bearings are like new. (I think he changed 99% the rod bearings, but 100 % not the main bearings of the crankshaft)

The crankshaft pin is like new without scores or fretting.
Because of the crankshaft diameter (std)60,305mm up to 60,317mm I can replace in my opinion new modern machined standard shells without any adjustment.
<span style="font-weight: bold">Or is it important to couple fitting tolerance parts for fine adjustment ? </span>

Bye michel- who work the first time in this area of the engine ( First I would only paint the engine.... )

 

[aeronca65t]

I would have no problem doing what you are talking about.

I replace the standard bearings in my race car (a Spridget) on a regular basis. It's never a problem.
They do not have to be "matched" as long as your crank pin measures correctly and you use good-quality bearings.

I also use Plastigage "just to make sure" each time.

I would suggest sourcing your bearings from Cape (in the UK) since they have an excellent reputation in terms of quality.

~Cape-International~

 

[Keoke]

Well there in lays the key good quality bearings. Presently in The UK and for a considerable time now Hazardous material dictates have prevented the manufacture and sale of the previous tri metal bearings. Consequently, if you can locate an NOS set of bearings then you will have quality --Fwiw--Keoke

 

[mikespain]

From the picture of the bearing,seeing the uneven wear, I would check very carefully the measurement of the crank journal along it's width to make sure that it is within tolerance

 

[germanmichel]

mikespain-hello,

I know that risk.... this was the worst case shell only the two in the middle has removed lead areas. The on the top and end side looks like new.
I think the new shells wash out on the same area...But
I don`t want to dismout the whole engine. This was an idea to stretch the life of the engine.

@ keoke :Thank you keoke to give me a good feeling about the King bearings.

Bye michel- who check today the oil pump tolerances and will order the parts.