Unfortunately, someone did not rebuild this engine properly 14 months ago. Here is what we found out after tearing into our 8V71TA that was rebuilt only 14 months , or 625 hours of use ago.
Since having it rebuilt in January 2019, we experienced loss of power (less than before the rebuild) , oil leaks, blow-by( oil coming out the breathers) low turbo boost, and multiple turbo failures.
What caused all of this? 2 things:
Fuel system was not pressure tested, leading to damage to bearings and turbo.
We are down to the last week of 2019 and what a year it has been! Join us in welcoming the new year with a blowout sale through January 5th, 2020. Take 10% off everything we sell and save big $$$. Use coupon code:
We at Diesel Rebuild Kits would like to take a moment to wish everyone a safe and happy 4th of July weekend. Remember to honor those that sacrificed it all for us to be celebrating today with family , friends and loved ones. Our offices will be closed on July 4th and July 5th but we will still be taking online orders.In celebration of our great nation’s birthday we will be offering 10 % OFF sitewide. Simply use: Coupon Code july410off
God Bless America! Enjoy a little patriotic rock for today’s festivities!
On this memorial day, while spending time with family and loved ones, take a moment to give thanks. We enjoy many freedoms that we sometimes take for granted. Lets take a moment to remember and honor our vets along with our first responders that sacrifice so much for all of us. Remember that our freedom does not come without a cost and we should be very grateful to those that risk it all day in and day out.
As a token of our appreciation, we will be offering 10% anything and everything on our site through May 31st, 2019 a midnight. Take advantage and save big!
Oil Pump Gear Mounting Caution on Various Kubota Diesel Engines
The AERA Technical Committee offers the following information on oil pump gear mounting caution for various Kubota diesel engines. This information applies to the Z482, D662, D722 & D782 engine models. It’s been reported earlier service manuals may not include a listed torque value for the oil pump gear mounting nut. Later, published service information may be applied to these engines, noting there are possibly different values according to engine serial numbers listed below. Observe the photo and chart below to mount the oil pump and gear for these engines.
7. Oil Pump Gear, a. Torque Nut to 36-41 FT/LBS (49-56 Nm) for Engines Below Serial #4EHZ999 b. Torque Nut to 29-32 FT/LBS (39-45 Nm) for Engines Above Serial #4EHJ0001
We are going mad during March Madness 2019! We are taking 10% off the entire site and even products we don’t show on the website. Absolutely every item we sell will go for 10 % off! Mention this post or use coupon code madness19 on the site while checking out.
Use Coupon Code Madness19 for 10% off through end of March 2019
Engine failure analysis can sometimes seem like you’re looking at a “Where’s Waldo” puzzle, but you may find that it all comes down to one detail that starts to tell the story of what caused the failure. Or, that one detail sets the timeline of the events that happened. Then it’s up to you to find Waldo.
You’ve probably seen a damaged piston like the one shown in the photo below and may have heard a similar story that an engine was freshly rebuilt, ran a short period of time, and then, “bam!”. Something happened, and the engine failed.
In this case, it happened to a Caterpillar model 3306 engine. The 3306 engines have been around for decades and have proven to be a tough workhorse of an engine that aren’t prone to having problems. As the story goes, the engine shown in these photos had a valve fail right after being rebuilt and placed into service.
The photos below were taken during the tear-down of the engine. Notice anything odd in one of the photos?
The head of the Valve is lodged in the crown of the piston.
The cylinder head is damaged & the valves are not in head
The failed valve stem is straight.
There is minimal impact damage to the fractured end of the stem.
The other valve from failed cylinder is bent & guide is broken
rocker arm components and push-rods were removed & stacked in valve cover
If you only had the broken valve to work with, you may be able to determine some wear patterns, signs of scoring or seizure, and some of the fracture characteristics from the broken stem. Lab analysis could provide material properties, hardness, and higher level of detail of the initiation point and type of fracture, but your analysis would be very limited.
Having all the parts and information involved in a failure can be the key to finding the root cause.
Steve Scott – IPD | Director of Product Development & Technical Support
Did you find what was odd in one of the photos above? The broken rocker arm shaft and bracket are not commonly damaged during a valve failure. Typically the push rods would be bent, but the bracket and shaft would be unharmed.
The force from a failed valve, especially without any major impact to the valve cannot reasonably break the rocker shaft or bracket.
The rocker shaft bracket in this application has an alignment dowel that centers the bracket to the cylinder head. Closer inspection of the bracket found the alignment dowel in this bracket has been severley damaged. The dowel material has been crushed between the bracket and head in a way that the bracket cannot seat flat to the cylinder head. With the bracket seating unevenly on the cylinder head, the force from torque of the bolt placed an undue stress on the rocker arm shaft, causing it to bend, and eventually break.
Closer inspection of the bracket found the alignment dowel in this bracket has been severely damaged
The rocker arm closest to the fracture of the shaft had evidence of uneven wear and scoring. This rocker arm is positioned directly over the fracture in the rocker arm shaft. With the rocker arm being unable to move freely, the valve was held in the open position and was impacted by the piston, breaking the valve and damaging the piston and cylinder head. No doubt those involved in building this engine have tried to recount how this could have happened, why the problem wasn’t detected during assembly or while adjusting the valves. A bizarre chain of events, and the damage follows a clear time line of the failure.
The dowel material has been crushed between the bracket and head in a way that the bracket cannot seat flat to the cylinder head. With the bracket seating unevenly on the cylinder head, the force from torque of the bolt placed an undue stress on the rocker arm shaft, causing it to bend, and eventually break.
The rocker arm closest to the fracture of the shaft had evidence of uneven wear and scoring. This rocker arm is positioned directly over the fracture in the rocker arm shaft.
This investigation found a very uncommon root cause but being so unusual demonstrates how critical looking past the obvious or perceived failure and at all the evidence can be. Manufacturers can have defective parts and even seasoned professionals can make mistakes, but metal doesn’t lie. Sometimes the evidence is destroyed before an engine can be shut down but spending the time and effort to thoroughly investigate a failure is in the best interest of all involved. When you can figure out the true cause(s) – you’ve found “Waldo”, and it can give you a feeling of accomplishment, but unlike the puzzle, when the answers are no longer there it can also be very frustrating.
Unfortunately to many of us take for granted everything our military and first responders do to keep us safe. Take a moment to give thanks for everything they do. This year we not only want to honor them but also give back to the community. After thorough research we have selected a charity for veterans for us to donate to as a company every year. We are also encouraging our staff to go out and volunteer some of their time for a good cause helping out veterans.
https://semperfifund.org/
Also from this day forward we will establish a 5% coupon off for all active and retired military.
