Cylinder numbering

**mattb5150** · 07-31-2009, 20:32

Can someone post how the cylinders in the Dmax are numbered? Need the injectors replaced on the bank that includes the #7 cylinder and want to test the shop to make sure they know which bank it is before they proceed.

Matt

**DmaxMaverick** · 07-31-2009, 21:11

Cylinders are numbered odd on the right (passenger side), and even on the left (driver side), lower numbers toward the front. #7 is the rear/right cylinder, closest the passenger seat.

**mattb5150** · 08-01-2009, 08:12

Thanks Mav,

This jives with another source on the web I found after I posted this question.

Matt

**DmaxMaverick** · 08-01-2009, 09:19

Your welcome.

It better jive with anything else you find. If for no other reason, because it's correct. GM, now and always, numbers cylinders according to their order on the crankshaft. If you look at the heads, you'll notice the odd cylinder bank ahead of the even, locating #1 forward of #2. The Duramax is opposite current/previous Chevy engines (even cylinders on the right bank, including 6.2/5L), but like some older BOP engines (even cylinders on the left bank). I have a Pontiac 350/350/350 in a 1968 GMC, and the cylinders are numbered the same as the Duramax.

**Duramaster** · 08-01-2009, 13:07

Still working on that Matt???

**JohnC** · 08-01-2009, 13:24

Cylinders are almost always numbered by their position on the crank shaft, starting at the timing end.

**mattb5150** · 08-01-2009, 15:51

Duramaster,

Yup. Just got the 4 injectors from partzoneonline and my new rear half for my transfer case. Taking the truck in on Tuesday and having the one bank of injectors replaced and the transfer case repaired, hope I'm doing the right thing and hope I caught it before the motor ends up like sgoodhope who's rebuilding one cylinder right now from what sounds like the same issue I'm having.

Matt

**Duramaster** · 08-01-2009, 20:11

I just had a Californian her this week with similar issues. Smoke, coolant smell, AC performance (yes it was 105 in the shop Wednesday with a breeze). His AC problem was the cabin air filters were the original ones at 185K miles. The coolant smell was the turbo coolant hoses and the water pump bypass hoses were leaking, The smoke is of course leaky fuel injectors as well as too much return volume. I fixed the AC and the coolant leaks and told him to leave the aftermarket crap disconnected until he gets home. Hopefully he makes it ok.

**dr.olds** · 08-06-2009, 17:26

Cyl. # are as follows, 1357 on paassenger side,(1 of course at front of engine) 2468 on driver side. Firing order - 12784563 sure isnt a small block chevy!

**mattb5150** · 08-07-2009, 13:01

Picked up truck yesterday afterhours, check light on at start up. Had code P2227, looked up seems like loose intercooler. Smokes like mad no bottom end. Cleared codes, ran better not as much smoke, thinking TCM may need to relearn after batteries disconnected? Started this morning and got CEL after one minute of idling. Pulled codes again got P2227 & P1404 this time. Cleared codes and drove to shop no power lots of smoke no CEL but had stored P2227 code. They say the mechanic drove it a bit had no problems, manager drove it a little and no problems. I hope its just a loose IC pipe.

The old injectors were really dirty, lots of rust looking stuff at the inlet (?) threaded male connector with o-ring and no plastic cap from rebuilds. #7 (supposed culprit injector) didn't look any worse than the others. #1 had a rolled o-ring and lots or carbon up past the copper washer the others didn't, probably burnt oil leaking down into the injector past the rolled o-ring?

Matt

**mattb5150** · 08-07-2009, 19:05

All seems well now, they had two vacuum lines near the fuel filter switched around.

Matt

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