03-07 Mack Chu613

[Oldeskool]

I'm new here, and have a question about the early EGR trucks. I read everywhere that they are awful and don't get one. I am curious what exactly is the problems? Is it mainly EGR? Can "fixing" EGR make one a decent truck? I am considering a Mack and just don't want to get a total lemon. Should I rather get a newer one with a MP8? Thanks guys

[JoeH]

Pull up a chair!

 

[JoeH]

In a nutshell, the camshaft, the exhaust manifold, the first bit of exhaust pipe, etc are designed to push exhaust back into the engine through restriction, in the hopes of re-burning it to make it cleaner. Lucky for those with the problem engine, there's parts from previous year models that bolt right on to replace those components, resulting in happy truck owners.

 

[OldRedMack]

33 minutes ago, JoeH said:

In a nutshell, the camshaft, the exhaust manifold, the first bit of exhaust pipe, etc are designed to push exhaust back into the engine through restriction, in the hopes of re-burning it to make it cleaner. Lucky for those with the problem engine, there's parts from previous year models that bolt right on to replace those components, resulting in happy truck owners.

 

Well, sorta.  That is for the AI series engines.  The AC series engines have an external egr and I'm not sure if anyone has tried to convert an AC into an AI.