c- model cam - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 29 (permalink) Old 10-07-2016, 12:21 AM Thread Starter
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c- model cam

going to change camshafts in my 8pn c model when i inframe it.Is there a better spec. cam to use than is in the 7fb engines?
maybe one of the marine or gen set cams?
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post #2 of 29 (permalink) Old 10-07-2016, 09:03 AM
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The 7FB 3012 cam depending on what one you have is better than the stock 8pn cam...the 3797 cam was used in most all other B and C models from late 7FB to the late 3zj's and is also a all around good working cam. Are you putting replacment 8Pn pistons and injector nozzles in it too?? Id definatly reccomend using an older, lower compression ratio/larger diameter bowl and nozzle combo if you want it to run better....the cam alone isnt gonna help it nearly as much as getting rid of the 16:1 pistons and nozzles will.

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post #3 of 29 (permalink) Old 10-07-2016, 12:29 PM Thread Starter
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I already have a set of 14.6.pistons. I have a early 7fb that i am going to rob the pump off .
also have a set of 3421 nozzles from same engine.
if need be i will use the camshaft from that engine also.
but if one of the higher horsepower marine or genset cams will do better like it does in
the E & C models I will go one of them.Just trying to see if there is something better.
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post #4 of 29 (permalink) Old 10-07-2016, 04:38 PM
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Quote:
Originally Posted by pete352110 View Post
I already have a set of 14.6.pistons. I have a early 7fb that i am going to rob the pump off .
also have a set of 3421 nozzles from same engine.
if need be i will use the camshaft from that engine also.
but if one of the higher horsepower marine or genset cams will do better like it does in
the E & C models I will go one of them.Just trying to see if there is something better.
As far as im aware of they all use the 3797 cam. Their is a different one for lower horsepower. The 7FB cam could be the 3012, or 3797. i would use either befor i kept the 8pn cam.

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post #5 of 29 (permalink) Old 10-07-2016, 05:01 PM Thread Starter
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If I remember correctly the 460 peec engine used a better cam.
but they now use the same #. I am in no rush as the engine runs
fine right now.I might just get a 800hp marine cam and get it checked
out on a cam doctor and see if it is the same as my 7fb cam.
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post #6 of 29 (permalink) Old 10-08-2016, 12:18 AM
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The 460 originally used a faster cam than anything but field replaces (NPR) to a 3797 in a B. no idea what the number was. it was strange and never reMan'd. There are several different ones for the C including four differnt versions of a 3014. A 3012 is a 400A DI cam and doesn't work beyond use with capsule nozzles. A 3013 is a 7FB above the 310 Economy thru 4MG03600 but field replaces (NPR) with a 3797. It is not, however, the same. either works with 14.5/ 14.6 but the correct match is a 3013. The 3797 was originally designed for the 15.2 4MG and also used in a few later non-economy 310 7FB's at 15.6/1. Look at the number in the front of the 7FB cam you have to verify what it is. And unless they are brand new, your 3421 nozzles are correct for the 10R 14.6/1 two piece, but only as cores. I'd replace them with a new motor. But with new, not reMan.
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post #7 of 29 (permalink) Old 10-08-2016, 12:38 AM Thread Starter
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thanks for the replies all input is welcomed.Tony, should i use the 8 bolt timing advance unit with the 7FB pump
or should i go with the 4 bolt off of the 7FB. I rebuilt it just before windowing block.
I also just rebuilt the eight bolt on the 8pn engine.I will have to get the other engine(7FB) apart and see what
cam is in it and go from there.thanx again everybody!
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post #8 of 29 (permalink) Old 10-08-2016, 02:04 AM Thread Starter
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Never mind on the last question! I should of used the search button first!
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post #9 of 29 (permalink) Old 10-08-2016, 10:29 AM
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Quote:
Originally Posted by pete352110 View Post
If I remember correctly the 460 peec engine used a better cam.
but they now use the same #. I am in no rush as the engine runs
fine right now.I might just get a 800hp marine cam and get it checked
out on a cam doctor and see if it is the same as my 7fb cam.
There is no 800hp marine cam for a mechanical engine. The 580hp marine C models uses the 0r3787 and as well as the 587hp generator set engines that the 10r1439 cylinder pack comes from.

Have your C model pump built so you can use the actual matching 0r8789(65% more fuel then a 3421) nozzle that comes in those engines.

Use pump cam 4p-0990, this is a pump cam that works in your C housing with your barrels and plungers that will allow you to use your 7FB timing advance and also has timing specs like the 24* pump cam used in the 7FB.

When the cams were changed from the 0R3013 to the 0R3787 this is the information that came out along with it.

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post #10 of 29 (permalink) Old 10-08-2016, 10:51 AM
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Quote:
Originally Posted by SmokinCAT View Post
There is no 800hp marine cam for a mechanical engine. The 580hp marine C models uses the 0r3787 and as well as the 587hp generator set engines that the 10r1439 cylinder pack comes from.

Have your C model pump built so you can use the actual matching 0r8789(65% more fuel then a 3421) nozzle that comes in those engines.

Use pump cam 4p-0990, this is a pump cam that works in your C housing with your barrels and plungers that will allow you to use your 7FB timing advance and also has timing specs like the 24* pump cam used in the 7FB.

When the cams were changed from the 0R3013 to the 0R3787 this is the information that came out along with it.

Exactly what i was thinking Cody...why would a guy of his knowledge go and reccomend a 3421 that in any other post of his would say it doesnt match the bowl?? And yes their was good reason why they stopped offering the 3012-13 cam in them and it wasnt cause it made too much power. You can only mix and match so many things without bad stuff happening and when they offer parts that match the 1439's (OR8789) and (3787)with big horsepower why not just go with them and not have too worry!? I havent built 15million motors or whatever he has but common sense will take a guy a long wayz in the right direction right?? Just sayin...hope i dont strike a nerve! haha

Larry
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