I just picked my pistons and rods up from the machine shop. (RS 84.5 on stock b20 rods)

I had the rods/caps re-tanged for GSR bearings... With the pistons/rods assembled. The new tangs are on the intake side of the piston... and the old tangs are still on the exhaust side... Looks like they goofed up? Am I FUBARED? doesn't removal of the pistons damage them?

 

If the machine shop pressed them on backwards then they should take care of it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by all-mtr-teg &raquo;</TD></TR><TR><TD CLASS="quote">If the machine shop pressed them on backwards then they should take care of it.</TD></TR></TABLE>

I sure hope so.

 

Damn, they have to fix that. You can't run that way.


Modified by mar778c at 10:10 PM 5/10/2008

 

Someone correct me if Im wrong but if they can press IN the new ones w/o damaging the pistons, can't they press them OUT w/o damaging them as well?

 

I recently had a friend who was trying to sell his stock B17 pistons, and reuse his B17 rods. The machine shops we contacted said they couldn't promise getting the pistons off without damaging them.
After taking them to one of the shops, they said they had put 2.5tons of pressure on the wrist-pin to get it out, thus smashing the piston and rendering it useless.
How they can put them on without damaging them is beyond me, but I haven't had luck with people being able to take pistons OFF without damaging them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by unified112 &raquo;</TD></TR><TR><TD CLASS="quote">
How they can put them on without damaging them is beyond me</TD></TR></TABLE>

You cant shrink the wrist pin in a bag of dry ice while its still on the piston.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">Damn, they have to fix that. You can't run that way.
</TD></TR></TABLE>

Im trying to think why the tangs HAVE to be on the exhaust side. I can't see what harm it would do to put them on the intake.


Modified by Furyof4 at 10:31 AM 5/12/2008

 

It sounds like he's saying the tang on the ROD is still on the exhaust side, yet the tang on the CAP is now on the intake side? They definitely should be matched up, and in oem position. Forgive me if I've got the wrong idea of the situation though.

 

Dry ice, and a oem piston pin will take it out with out damage.

 

a friend of mines got his ls pistons pressed off at our local NAPA, and they cracked/crushed one piston but got the other 3 with out any problems, but they didn't want to press the b16 pistons on because they didnt want to risk cracking the others by pressing them on so they didn't charge him but he had to go to another shop to get them pressed on. i believe they will warn you that their is a chance of the piston being destroyed though.

 

most shops around here use heat on the small end of the rod to slide the pins in and out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by unified112 &raquo;</TD></TR><TR><TD CLASS="quote">It sounds like he's saying the tang on the ROD is still on the exhaust side, yet the tang on the CAP is now on the intake side? They definitely should be matched up, and in oem position. Forgive me if I've got the wrong idea of the situation though.</TD></TR></TABLE>


I had them retanged for GSR bearings...so the rod and cap has to have retanged oposite of the b20 tangs... so the both the original tangs are on the exhaust side...rendering them useless for GSR bearings...


Damnit... I was afraid of this... hopefully this shop comes through... if they cant safetly remove them... then I would sure hope they make good on replacing the pistons.

 

If the B20 tangs are on the EX side, then they did it right and you are the dummie. Are you going to drill the oiling hole in the top bearing half? If so why? If not, why?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote">If the B20 tangs are on the EX side, then they did it right and you are the dummie. Are you going to drill the oiling hole in the top bearing half? If so why? If not, why?</TD></TR></TABLE>

thanks for calling me a dummy. yeah the b20 tangs are currently on the exhaust side. correct me if im wrong... the bearings can only spin on way... I had to have the b20 rods retanged to the oposite side of the rod/cap... thus putting the "new" tang on the original intake side of the rod/cap... now since the bearings spin one way... the "new" tang needs to be on the exhaust side... its not. the piston is on backwards

hadn't planned on drilling the oiling hole... why? from what i've read/been told/heard it is not necessary.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOHC_C-REX &raquo;</TD></TR><TR><TD CLASS="quote">the bearings can only spin on way</TD></TR></TABLE>

Bearings are supposed to spin?

Ive been doing something very very wrong.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">

Bearings are supposed to spin?

Ive been doing something very very wrong.</TD></TR></TABLE>

you know what I ment... the crank is ment to spin on the bearing in one direction.

 

Are you sure? Are you sure the tangs arent just to locate the bearing on the rod? Does the tang actually hold it in place or is it the "crush"? Bearings are not a perfect circle, they are wider at the parting line than @ 90 deg to it, but they do not differ in thickness from the left of the bearing to the right of the bearing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Combustion Contraption &raquo;</TD></TR><TR><TD CLASS="quote">Are you sure? Are you sure the tangs arent just to locate the bearing on the rod? Does the tang actually hold it in place or is it the "crush"? Bearings are not a perfect circle, they are wider at the parting line than @ 90 deg to it, but they do not differ in thickness from the left of the bearing to the right of the bearing.</TD></TR></TABLE>


so are you saying that it does not matter if the bearings tang is on the intake or exhaust side? if it was possible they could go in either way?

 

i remember rebuild a dodge 4.7l that had a spun rod bearing. i got a new rod & crank from mopar & the rod didn't have any tangs in it. i thought they messed up. i called there tech line & they said to just grind the tangs smooth on the bearings & assemble the engine normally. so i believe you don't even need tangs, or maybe just on some engines.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by frostyrb &raquo;</TD></TR><TR><TD CLASS="quote">i remember rebuild a dodge 4.7l that had a spun rod bearing. i got a new rod & crank from mopar & the rod didn't have any tangs in it. i thought they messed up. i called there tech line & they said to just grind the tangs smooth on the bearings & assemble the engine normally. so i believe you don't even need tangs, or maybe just on some engines.</TD></TR></TABLE>


who knows? that was a dodge 4.7L...maybe just on some engines...My main concern now is...does it matter what way the bearing sits? does it matter what way they spin?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOHC_C-REX &raquo;</TD></TR><TR><TD CLASS="quote">
My main concern now is...does it matter what way the bearing sits? does it matter what way they spin? </TD></TR></TABLE>

If it mattered which way they spin then wouldn't bearing manufactures have specific instructions.

Look into the construction of a bearing.

The tang is to "hold" the bearing in place. Also what bearings do you plan on using?

 

What is the mixup? Why'd you have them machine the B20 rods to have the tang on the intake side when GSR bearing tangs already on the EX side like the B20 rods? Main difference is the GSR bearings are narrower than the B20/LS bearings and don't have the oil orifice which I would drill if I were you assuming your not running oil squirters





Modified by all-mtr-teg at 11:38 PM 5/11/2008

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Thrizzle &raquo;</TD></TR><TR><TD CLASS="quote">

If it mattered which way they spin then wouldn't bearing manufactures have specific instructions.

Look into the construction of a bearing.

The tang is to "hold" the bearing in place. Also what bearings do you plan on using?

</TD></TR></TABLE>

well if thats the case...then im ok. I understand that tang is just to hold it...but I thought that they put on the exhaust side for a reason.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by all-mtr-teg &raquo;</TD></TR><TR><TD CLASS="quote">What is the mixup? Why'd you have them machine the B20 rods to have the tang on the intake side when GSR bearing tangs already on the EX side like the B20 rods? Main difference is the GSR bearings are narrower than the B20/LS bearings and don't have the oil orifice which I would drill if I were you assuming your not running oil squirters
Modified by all-mtr-teg at 11:38 PM 5/11/2008</TD></TR></TABLE>

I couldn't use the GSR bearing in the b20 rods without retanging and the only way to retang them is to move the tangs to the intake side of the rod...I thought it was necessary to then rotate the rod 180 so the new tangs (intake side) would then be on the original exhaust side...because I thought it mattered what way the bearings were installed.

the other difference is the tri-metal, hold more oil, less friction service, last longer etc...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DOHC_C-REX &raquo;</TD></TR><TR><TD CLASS="quote">

I couldn't use the GSR bearing in the b20 rods without retanging and the only way to retang them is to move the tangs to the intake side of the rod...I thought it was necessary to then rotate the rod 180 so the new tangs (intake side) would then be on the original exhaust side...because I thought it mattered what way the bearings were installed.

the other difference is the tri-metal, hold more oil, less friction service, last longer etc... </TD></TR></TABLE>

In the photos I posted, the tangs are on the EX side for both the GSR and B20 rods?