Alcyone
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- VY 2003 V6 Ecotec
Got 2 things going on with a rebuild; VY V6 3.8L Ecotec...
(1) 2nd ring end gaps are measuring at 0.48mm-0.50mm whereas the Haynes manual is showing specs wanting to be in between 0.762mm-1.016mm.
I rang the machining shop where some work was done and where I got the Hastings rings from. Chap there said that the measurements I'm getting are well within spec and that he himself would still fit them without any filing. Any thoughts? I am also getting 0.48mm-0.50mm with the top ring and the Haynes manual is wanting 0.305mm-0.559mm for those ones. All seems okay with them. Why are the 2nd rings so tight? Should I leave them as is or should I file them back? I only have the Haynes manual to refer to yet the chap at the machining shop said that the measurements I'm getting are fine. Oil control rails are also within spec.
(2) When putting the pistons back onto the rods, I am placing the notch on the piston (see pics) towards the front of the engine. I had everything in order before taking stuff to the machining shop and they even engraved the pistons etc. But putting them back together, I'm not sure which way to face the rods. (EDIT: The rods were removed from the pistons and I'm not sure when putting them back together which way is up or down). They have an assortment of numbers on the front and back but all those markings seem pretty random. Is there any way to definitely read something on them to know? Chap at the machining shop said to place the bearing tang insert 'left of centre'. Can someone explain that any better please? Does that mean that the tang goes in the upright position when putting the rod caps back on? When I say upright, I mean upright when I'm looking at things with the engine upside down and I'm able to screw the bolts in from that position. I didn't explain that very well. The way I've taken the photo is what I mean. Tang up the top which I guess means left of centre of the crank?
Cheers if anyone can provide some information
Pic 1 - Showing tab on piston which means its positioning to front of engine.
Pic 2 - Showing tab on piston facing the front and the bearing tangs on the upper side of the big end.
(1) 2nd ring end gaps are measuring at 0.48mm-0.50mm whereas the Haynes manual is showing specs wanting to be in between 0.762mm-1.016mm.
I rang the machining shop where some work was done and where I got the Hastings rings from. Chap there said that the measurements I'm getting are well within spec and that he himself would still fit them without any filing. Any thoughts? I am also getting 0.48mm-0.50mm with the top ring and the Haynes manual is wanting 0.305mm-0.559mm for those ones. All seems okay with them. Why are the 2nd rings so tight? Should I leave them as is or should I file them back? I only have the Haynes manual to refer to yet the chap at the machining shop said that the measurements I'm getting are fine. Oil control rails are also within spec.
(2) When putting the pistons back onto the rods, I am placing the notch on the piston (see pics) towards the front of the engine. I had everything in order before taking stuff to the machining shop and they even engraved the pistons etc. But putting them back together, I'm not sure which way to face the rods. (EDIT: The rods were removed from the pistons and I'm not sure when putting them back together which way is up or down). They have an assortment of numbers on the front and back but all those markings seem pretty random. Is there any way to definitely read something on them to know? Chap at the machining shop said to place the bearing tang insert 'left of centre'. Can someone explain that any better please? Does that mean that the tang goes in the upright position when putting the rod caps back on? When I say upright, I mean upright when I'm looking at things with the engine upside down and I'm able to screw the bolts in from that position. I didn't explain that very well. The way I've taken the photo is what I mean. Tang up the top which I guess means left of centre of the crank?
Cheers if anyone can provide some information
Pic 1 - Showing tab on piston which means its positioning to front of engine.
Pic 2 - Showing tab on piston facing the front and the bearing tangs on the upper side of the big end.