I seem to have some pages missing from my Service manual so can anyone tell me what the torque specs and sequence is for the exhaust manifold? Anyone? Thanks.

And also, does anyone make a better exhaust manifold gasket or know of one that will work on this engine? Everyone makes upgrade gaskets for the 6B but I cant find anything on this one.

 

Sure you're not asking about an ISL9? If so it's the same engine as an ISC8.3 just stroaked. Try some marine gaskets for a QSC8.3-540.

 

I don't have that info sorry.


I'm pretty sure he knows L10/M11 engines aren't C series.

 

I wish it was! Its actually a LTA10 in a Volvo city truck. Not a Celect either. I cant stand these little half breeds as I call them but they pay the bills I guess. So does anyone have the specs I need? I never thought about a marine gasket but I dont know any specs on the marine stuff and I know my parts guy at Cummins wont have a clue if I tell him I want some marine gaskets that will fit an L10.

I would like to find some with the fire rings around them. Mack went to that style on the newer E7 engines and if you put them on the old school E6 you never have to worry about one blowing again. Helps seal off if the manifold is a little warped as well.

Thanks for the help so far.

 

I guess there might be a Cummins engine I haven't heard of, but all I know is the L series was reliesed in 1998, & is a stroaked C series engine. The M-11 IS a bigger engine platform. I'll dig through some of my notes from old customers, & see if I can get a QSC-540 serial# for you if you want.

 

You seriously never heard of an L10? I wish I never had! They are alright but they dang sure aint no ISX! For sure send me a serial number for the QSC. I would like to see what the gaskets look like compared to the stock L10. Thanks.

Look at the bottom of this page and it makes a special note to not confuse the ISL with the L10. That paragraph explains what Cummins did.


http://en.wikipedia.org/wiki/Cummins_L_Series_engine

 

Very well. I stand corrected. In my defence, that engine was discontinued about the time I got out of school. In 23 yrs as a diesel tech, I've never seen one. I did look for a ser # for you in one of my ledgers, but came up empty on a QSC-engine. Lots of B's, tho. I'll look elsewhere tomorrow. Also You might try a M-11 gskt. Might be the same pattern.

 

I dont see how anyone could ever keep up with all the models cummins put out, i sure cant! I may try the M11 and see. Does anyone have the torque spec though?

 

You could torque it by bolt size. Most every cummins manual has a generic torque table for bolt sizes in the back. I have manuals for the engines I'm familliar with.(Not that one obviously)

 

I talked to my local parts guy, & had him look up the M-11, & L-10 gskts, & they were the same P#. As for the sequence. Start in the center, torque the center top on 1 side of the turbo mount, & then the opposite across the turbo mount, then the other center top, then botton, & cross top to bottom, &,side to side as you work out to the ends.. Like a wheel. And as the gaskets are the same for the M-11 I'd use the same torque as an M-11. Step 1-20#, step 2-30#. this also was set using anti seize on the bolts.

 

Bigwheels, you are da man! I was figuring on about 45ft/lb so I am glad you chimed in with those numbers. I was actually at Cummins today asking about a different style gasket but had no luck. The parts guy was typical, " i can give you what the serial calls for." I will follow your sequence and specs and see what I get. I always use anti-seize on exhaust manifold bolts! Its always amazed me how little the manifold bolts torque to with those graphite coated gaskets. I think that may be why I have a repeat failure on my hands with this one. I may have squashed the graphite material out of one completely. This thing also has a severe overfueling issue that may be causing it. I am going to fix these gaskets and tell the customer to get it to our local fuel shop to get a check up. Thank you so much for going above and beyond for me man, I sure do appreciate it. If you ever get your hands on a Mack and need something just let me know. I know them inside and out and upside down!

 

You're welcome. Glad to help. BTW, have you run a straight edge across the surfaces? Just asking. Are you blowing the same one all the time, or is it migrating from one to another? Also, how about the down pipe? Is it secured, & fitting properly? I've seen a down pipe that pulled hard on the turbo warp the manifold under heavy loads from the heat.

 

I straitedged everything when I did them and all looked great. The down pipe is secured as it should be and when I took it off it wasnt under pressure or anything. It just rested right where it was. First it was number 3. Now its number 2. I think the excessive fueling is whats causing this issue.