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AERA Weekly Technical Bulletin | June 29th 2016

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Injector Sleeve Installation on John Deere 6090
Diesel Engines
The AERA Technical Committee offers information on the installation of injector sleeves for John Deere 6090 diesel engines. This repair is done after the cylinder head has been removed from the engine block and the head is placed on a sturdy workbench.
Follow the procedure listed below after obtaining the new injector sleeves and special tool JDG1649A. Do not remove or mix sleeve O-Rings. Service sleeve is provided with O-Rings installed on it. The upper O ring is diesel fuel compatible while the lower one is coolant compatible. Both O-Rings are identified by a different color and are not available as spare parts from John Deere.

Valve Guide Wear on 2006-2016 GM 7.0L LS7 Engines
The AERA Technical Committee offers the following information on valve guide wear on 2006-2016 GM 7.0L LS7 engines. Excessive valve guide wear has been reported on some of these high performance engines. Valve train noise and drivability concerns may be associated with this condition.
Observe the following cautions before repair attempts are made while determining if excessive valve guide wear exists. Valve guide clearance is determined by measuring the guide bore inside diameter and subtracting the actual valve stem diameter. The maximum valve guide service limit for both valves is .0037" (.093 MM). Refer to the chart below while determining component reuse.

Valve Seat Failures on 3.7, 4.7, 5.7 & 6.1L
Chrysler Engines
Have you ever had a set of cylinder heads come into the shop from a Chrysler, Dodge or Jeep application and the customer says, "when I took the valve cover off, I found the rocker lying on top of the cylinder head" or "the engine has a valve- train issue with it." Well, that seems to be a common problem with the above mentioned applications that have the 3.7, 4.7, 5.7 and 6.1L engine and we believe we know what the problem is.
While researching this problem, AERA has found no documentation from the OE stating what is causing this to happen. We have received several calls from AERA members regarding this issue and the AERA Technical Department can only speculate that the cause of this problem is the valve seat does not have sufficient
press fit into the cylinder head. "What is the factory press fit," you ask? Well, that
we do not know; all we believe is that the press fit being used is not enough to keep the valve seat in the cylinder head.
With the help of an AERA member who supplied us with some pictures, we hope to clarify the problem and explain it so that this information can be given to the customer as a way to better understand the problem and why replacement of the valve seats is recommended.
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