Head studs and end gap

[Rickrod3]

On 2 of the studs that go through the jugs and through the heads, have a rubber sleeve.
Should all of the studs have them?
I believe these sleeves made it a pita to remove the jugs.

Also one rings end gap was .439mm is it still okay to reuse since it is below the 1mm wear limit.
It's the only ring that does not fall between .2 and .4mm

Tia
Rick

[mro]

On cylinder one and four, front inside studs have a sleeve. Most likely there to help center the jugs. Don't remember if it's on all years or not and I've never had an XJ apart. Don't think it's rubber, maybe some kind of plastic.

Rings are hard to come by. I'd use it on one of my own bikes, but not on a "customers" unless he/she said to. Should not be a problem .....


mro

[mro]

Rings are hard to come by. I'd use it on one of my own bikes, but not on a "customers" unless he/she said to. Should not be a problem .....

Must have not had enough coffee, your ring is still within specs
Out of spec would be above .499


mro

[Rickrod3]

Thanks a bunch Mro

Rick

[red bandit]

How does .499 fall between .2 and .4?

[motoman]

refer back to MRO's statement, coffee,etc.

[trbig]

Out of spec would be above .499

According to the book, (At least my book) it has the ring gaps for standard being .2-.4mm. I take that as a stock reading. It says the wear LIMIT is 1.0mm which means to me that it would be in spec until the 1mm limit is reached.

Common sense says you should get them all as close as you can for equal compression readings, but I think you'll be fine with what you have.


Tod

[Rickrod3]

TR:

I guess what I was trying to do was verify my understanding of the ring and end gap spec.

there is a column under specification which for compression rings is .2mm to
.4mm

column to the right labeled as wear limit states 1mm

I have just one ring at the top of the cylinder which has a .439 end gap at the bottom the end gap is less than .4

It is under the 1mm wear limit.

Does this mean normally between .2mm and .4mm and must be replaced @1MM
I searched threads another chap had a simular question as I recall his end gap was .7 he also asked since it was under 1mm could he reuse it?
there were no posts after his question.
Sorry guys I'm Catholic and looking for absolution
Thanks in advance
Rick

[mro]

I guess everybody must be slowing down some
Years ago I posted a "wrong" answer once ... and every guru in a matter of minuets had a field day pointing it out (even that shade tree mechanic TC got in on the fun).

I’ve got a pretty bad case of CRS, so when ever I get ready to leave or do something I review what I’m about... this time my post popped into my head as I was heading out the door. Prometheus would have never let it slide for two hours

Rick,
A specification wear limit, general means plus or minus the spec and amount of allowed wear. In the example of the guy with the .7 end gap measurement, he should have filed the gap to at least .11 to bring it into the specifications range. Too little gap and the ring could bind in the cylinder as it expands from heat causing XSive wear on the cylinder wall and maybe damage to the piston or even the ring breaking in extreme cases, while too much gap would allow "blow-by" from the combustion chamber which can cause oil fouled spark plugs, smokey exhaust, or an air filter full of oil etc..

mro

[DGXSER]

In the example of the guy with the .7 end gap measurement, he should have filed the gap to at least .11 to bring it into the specifications range.

OK, I ain't Prom (no one could be) but I think you need more coffee, or picked the wrong week to give up sniffin glue, or something.

If the spec says .2-.4 mm gap and the gap is .7, aint that bigger than spec?? Filing would only remove material and make the gap bigger right?

I am assuming that the +/- 1mm should read +/- .1mm which is being read to make the actual tolerances .1-.5 mm. It seems like a tolerance of .2-.4 mm is pretty meaningless if you add +/- 1 mm to it.

[mro]

Filing would only remove material and make the gap bigger right?

Anyone with more than about dozen posts used to be fair game to mock and beat up for any little mistake or typo. I need to talk Prometheus and see if he can find the time to come back and show you newbees how it’s done...
Is the new XS11.com a “kinder and gentler place” ?

mro

[Rickrod3]

Mro:
I for one appreciates yours and anyones Else's efforts to help.
I understand if someone makes a mistake it was probably not intensional and we have to take ultimate responsibility for the information we receive.
I glad to have a place like this where people like you take the time to offer assistance.

Thanks
Rick

[DGXSER]

Filing would only remove material and make the gap bigger right?

Anyone with more than about dozen posts used to be fair game to mock and beat up for any little mistake or typo. I need to talk Prometheus and see if he can find the time to come back and show you newbees how it’s done...
Is the new XS11.com a “kinder and gentler place” ?

mro

You know, I have learned the very hard way over a long time to be kinder and gentler so I don;t look quite as much like a huge A-hole when I turn out to be wrong!!