3500 V6 an interferance engine?

[Guest]

I finally got the 7x ring installed on the crank and then installed the crank in the block but noticed a stopping point before I could rotate the crank 360 degrees. I haven't confirmed it yet but the only thing I can think of that's causing it is an open valve since the timing gear and chain has not been reinstalled yet and there are no plugs in it. I have to install the reground turbo cam anyway so I should know by next weekend. Then I'll move on to the ignition mock up to test proper firing.

If anyone has a GOOD pin and sensor wiring diagram for the TGP 727 ECM I would appreciate it. The one I downloaded off line is not as clear as I need it to be.

[Joseph Upson]

It's affirmative, although not likely to ever be an issue under normal circumstances, when you are working on an engine it is important to know. If you are turning the crank to connect or disconnect rods with the cam, rockers and pushrods installed, and the timing chain removed, one spirited turn of the crank with force is all it would take to cause a serious headache and a lot more expense and work.

It was necessary in my case to have such a circumstance but could present in such away during an assembly since no valve adjustment is required, you can just put things into place without thinking about it.

One nice thing about having the engine on the stand is that I was able to replace the cam without removing the lower intake manifold by simply turning the engine upside down and removing the pushrods so the lifters would clear it.

[geoffinbc]

Yes they are interferance motors. All 660's are. I know some people have broken chanins and the motor did not get damaged. But they are just lucky the engine stopped where it did.

Shit My dad broke a rod in a VW Aircooled motor it broke right by the big end and with the cylinder at the top of the bore. My dad pulled the plug out and drove the buggy out. So sometimes you just get lucky.

In your case looen all the rockers off

[Guest]

Hahahah you are so wrong dude. STFU with this misinformation. Everyone here with 60 degrees and all these failures you mention and not one has damaged anything? Shouldnt' that tell you something?

They are not interference motors.

[Joseph Upson]

Hahahah you are so wrong dude. STFU with this misinformation. Everyone here with 60 degrees and all these failures you mention and not one has damaged anything? Shouldnt' that tell you something?

They are not interference motors.

Probably not the cast iron head motors, but the aluminum heads with splayed valves at least in the 3500 are. The only difference between yesterday and the inability to rotate the crank 360 degrees and today and no problem rotating the crank 360 degrees is the removal of the rockers, pushrods and cam. So the angle on the valves is definately coming into play in this circumstance.

[CNCguy]

They are not interference motors.

3900 is interference also

[geoffinbc]

Hahahah you are so wrong dude. STFU with this misinformation. Everyone here with 60 degrees and all these failures you mention and not one has damaged anything? Shouldnt' that tell you something?

They are not interference motors.

Yes they are man. I only said some people get lucky. I know some on this site who have bent valves or smashed them. They always have been interferance motors. And what numbers of failures are you talking about? I have only herd of a couple broken chains from this site.