Pulled the rest of the Main Bearings (2-6)
 

Hey Guys,

Here's a pic of the main bearings from #2 through #6 where #2 is at the
bottom of the pic and # is at the top. You can see the worst is #6 and I'm
curious about #3. What is that thing wrapped around the sides of #3. Is
that spacer suppose to be there or is it a "fix" of some kind.

Mike, does your theory still hold true? Does this look like it would be
caused by #2 or is this engine just freaky (nice cylinders without
crosshatch with bad bearings)?

http://members.bigvalley.net/wuji/je...earings2-6.jpg

If this was local to #2 I was building up to fixing this myself (honing,
mic'ing, replacing bearings, replacing rings) but now I don't know.

Thanks,

Billo

Re: Pulled the rest of the Main Bearings (2-6)
 

That thing wrapped around #3 is the thrust bearing, which controls
crankshaft movement fore and aft.

If you are looking to just put bearings in, go buy a set and run a
plastigage check on each main, and that will tell you if the crank is worn.
All of the wear that I see isn't unusual for high mileage. It is just time
for some overhaul work.

Jerry


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c260fg$1qd1g4$1@ID-193866.news.uni-berlin.de...
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and
I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo
>
>

Re: Pulled the rest of the Main Bearings (2-6)
 

That thing wrapped around #3 is the thrust bearing, which controls
crankshaft movement fore and aft.

If you are looking to just put bearings in, go buy a set and run a
plastigage check on each main, and that will tell you if the crank is worn.
All of the wear that I see isn't unusual for high mileage. It is just time
for some overhaul work.

Jerry


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c260fg$1qd1g4$1@ID-193866.news.uni-berlin.de...
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and
I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo
>
>

Re: Pulled the rest of the Main Bearings (2-6)
 

That thing wrapped around #3 is the thrust bearing, which controls
crankshaft movement fore and aft.

If you are looking to just put bearings in, go buy a set and run a
plastigage check on each main, and that will tell you if the crank is worn.
All of the wear that I see isn't unusual for high mileage. It is just time
for some overhaul work.

Jerry


"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c260fg$1qd1g4$1@ID-193866.news.uni-berlin.de...
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and
I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo
>
>

Re: Pulled the rest of the Main Bearings (2-6)
 

"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c260fg$1qd1g4$1@ID-193866.news.uni-berlin.de...
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and
I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo
>
>

The easy question first. The #3 bearing is different because it is a thrust
bearing. This keeps the crank from moving axially. There should be a spec
for crankshaft end play in your manual. It is normally about .005 to .010"
depending on the engine manufacturer. The surfaces that the bearing rides
against on the crank should be checked for wear if you are going to reuse
it.

Nothing really stands out as a big problem with the bearings, but they
probably have a lot of miles on them. It is normal to see a different amount
of wear from front to back on engine bearings. The oil is fed through the
crankshaft, so some of the bearings take longer to get oil than others. I'm
not real sure on the oiling schematic for the 258, so I may be out to lunch
on this one.

Chris

Re: Pulled the rest of the Main Bearings (2-6)
 

"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c260fg$1qd1g4$1@ID-193866.news.uni-berlin.de...
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and
I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo
>
>

The easy question first. The #3 bearing is different because it is a thrust
bearing. This keeps the crank from moving axially. There should be a spec
for crankshaft end play in your manual. It is normally about .005 to .010"
depending on the engine manufacturer. The surfaces that the bearing rides
against on the crank should be checked for wear if you are going to reuse
it.

Nothing really stands out as a big problem with the bearings, but they
probably have a lot of miles on them. It is normal to see a different amount
of wear from front to back on engine bearings. The oil is fed through the
crankshaft, so some of the bearings take longer to get oil than others. I'm
not real sure on the oiling schematic for the 258, so I may be out to lunch
on this one.

Chris

Re: Pulled the rest of the Main Bearings (2-6)
 

"William Oliveri" <wuji@bigvalley.net> wrote in message
news:c260fg$1qd1g4$1@ID-193866.news.uni-berlin.de...
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and
I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo
>
>

The easy question first. The #3 bearing is different because it is a thrust
bearing. This keeps the crank from moving axially. There should be a spec
for crankshaft end play in your manual. It is normally about .005 to .010"
depending on the engine manufacturer. The surfaces that the bearing rides
against on the crank should be checked for wear if you are going to reuse
it.

Nothing really stands out as a big problem with the bearings, but they
probably have a lot of miles on them. It is normal to see a different amount
of wear from front to back on engine bearings. The oil is fed through the
crankshaft, so some of the bearings take longer to get oil than others. I'm
not real sure on the oiling schematic for the 258, so I may be out to lunch
on this one.

Chris

Re: Pulled the rest of the Main Bearings (2-6)
 

Hi Bill
That was nice of to leave the rear main in to hold the crank. ;-)
Have you ever seen a crank laying on it's side? The wear of the inserts
could only have been made by a poorly ground journals, looks like the
thrust main is cut way smaller, unless that's a new insert you're
showing us. Anyway I'd just put new inserts and rings and go with it.
Number two is just a little worst than the others, but just enough to
foul the plug and suck oil, making it look worst.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

William Oliveri wrote:
>
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo

Re: Pulled the rest of the Main Bearings (2-6)
 

Hi Bill
That was nice of to leave the rear main in to hold the crank. ;-)
Have you ever seen a crank laying on it's side? The wear of the inserts
could only have been made by a poorly ground journals, looks like the
thrust main is cut way smaller, unless that's a new insert you're
showing us. Anyway I'd just put new inserts and rings and go with it.
Number two is just a little worst than the others, but just enough to
foul the plug and suck oil, making it look worst.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

William Oliveri wrote:
>
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo

Re: Pulled the rest of the Main Bearings (2-6)
 

Hi Bill
That was nice of to leave the rear main in to hold the crank. ;-)
Have you ever seen a crank laying on it's side? The wear of the inserts
could only have been made by a poorly ground journals, looks like the
thrust main is cut way smaller, unless that's a new insert you're
showing us. Anyway I'd just put new inserts and rings and go with it.
Number two is just a little worst than the others, but just enough to
foul the plug and suck oil, making it look worst.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

William Oliveri wrote:
>
> Hey Guys,
>
> Here's a pic of the main bearings from #2 through #6 where #2 is at the
> bottom of the pic and # is at the top. You can see the worst is #6 and I'm
> curious about #3. What is that thing wrapped around the sides of #3. Is
> that spacer suppose to be there or is it a "fix" of some kind.
>
> Mike, does your theory still hold true? Does this look like it would be
> caused by #2 or is this engine just freaky (nice cylinders without
> crosshatch with bad bearings)?
>
> http://members.bigvalley.net/wuji/je...earings2-6.jpg
>
> If this was local to #2 I was building up to fixing this myself (honing,
> mic'ing, replacing bearings, replacing rings) but now I don't know.
>
> Thanks,
>
> Billo