: Coolant crossover



stoveguyy
01-04-13, 02:11 PM
Question on 05+ northstar motors. Since the front of heads has the cam sprockets, does GM still use a rear mounted coolant crossover design? I am talking about the rear wheel drive cars. Like the Sts, srx?

Ranger
01-04-13, 02:43 PM
I don't believe so. I think the crossover and rear mounted W/P went away when the engine became longitudinally mounted.

stoveguyy
01-04-13, 04:45 PM
I think the coolant crossover has upper ports for the heads and lower ports that attach to the block? Kind of like a "K" shape. How they fit that onto the front of a rwd motor with cams/chains seems real awkward. Maybe the intake is a wet design.

Ranger
01-04-13, 09:33 PM
Maybe the intake is a wet design.
It doesn't "appear" to be.

http://www.gmpartsgiant.com/Page_Product/PartDetail.aspx?&Make=Cadillac&Model=STS&Year=2005&MakeCode=K&ModelCode=D&CatalogCode=68D&mCode=6DW29&eCode=LH2&majorIndexID=00&SupplGroup=80&minorIndexID=6E00-007&ART_SUFFIX=D&SortKey=48
http://www.genmotorinfo.com/images/00/0704186E00-007.png



http://www.gmpartsgiant.com/Page_Product/PartDetail.aspx?&Make=Cadillac&Model=STS&Year=2005&MakeCode=K&ModelCode=D&CatalogCode=68D&mCode=6DW29&eCode=LH2&majorIndexID=00&SupplGroup=80&minorIndexID=6E00-008&SortKey=49
http://www.genmotorinfo.com/images/00/0511026E00-008.png

stoveguyy
01-04-13, 11:03 PM
Wow. The front of the fwd motor seems so simple now.

Submariner409
01-05-13, 11:10 AM
Maybe yes, maybe no - try to get to the oil pump or timing chains..................... without removing the entire throttlebody assembly, A/C and radiator systems.

stoveguyy
01-05-13, 12:30 PM
I see the pic with the front cover sort of neglects to show the end of the crankshaft?

Submariner409
01-05-13, 01:52 PM
Those diagrams are from the external engine parts section. Further snooping in www.gmpartsgiant.com will open the internal parts diagram.

stoveguyy
01-08-13, 08:25 AM
so the front cover is hollow? or partially hollow since the waterpump mounts to the casting and coolant flows thru it and the timing chains are behind the cover and are in an oil bath.

scott f
01-09-13, 08:45 AM
I don't see the typical "EGR" either

Ranger
01-09-13, 11:18 AM
That's because the RWD Northstar (LH2) also got "continuously variable valve timing on both intake and exhaust sides", eliminating the need for EGR.

Submariner409
01-09-13, 02:08 PM
deleted...............