F300 4.2. Thrust bearing failure

[rodbolt17]

before I installed it I would carefully measure the shaft spline depth and the amount of drive shaft spline engagement.
this will require attaching the lower to the midsection and doing a bit of math.
to properly clean the oil sump and strainer will require midsection disassembly.
trust me its full of metal.

[formula29]

Thanks rodbolt, I actually just came in from reassembling the midsection,oil pan, it had some burnt oil in it but not any noticable chunks, all of the gaskets needed for the oil pan, mid section are on national back order, I got lucky and found them on e-bay and they showed up today,, now I am waiting on the new belt tensioner and idler pulley's so I can complete this project, I just called the dealer and one of the parts is comming from japan! oh boy,

[engdept1]

New member here. Sorry for resurrecting a old thread. I'm considering buying a 29 regulator that has a pair of 06/2010 f300s with 340hrs. I thought these were supposed to be the best of the best until I started reading about the bearing issue. Has this become a widespread issue or is it hit or miss? Really don't want to buy a set of engines that I'm guaranteed to have to tear down in a few hundred hours.

[rodbolt17]

the 06 f300 should be a V8.
start a new thread and post the full model number.
are you sure it is even a four stroke 300???

[engdept1]

the 06 f300 should be a V8.
start a new thread and post the full model number.
are you sure it is even a four stroke 300???

Maybe i should of been more clear. They were manufactured June of 2010. Definitely 4.2. They weren't hung until sometime in 2012.

[boscoe99]

The thrust bearing issue is hit or miss. It is not widespread atall. The innerweb makes all problems appear to be worse than they actually are.

More hits and less misses in the SHO model. Less hits and more misses in the Offshore models. Problem appears IMO to be related to how the motor is operated.

With 340 times on the motors under consideration I would see that as a complete miss.

But we are talking about used motors here. Could run a long long time and could fail tomorrow. Just like us.

[engdept1]

Thanks. That's what I figured. Just trying to do all the homework I can before I spend the money.

[engdept1]

Update. Found out one of the engines on the boat I'm looking at broke the timing belt with under 200 hours. I'm assuming this was a thrust bearing failure. The other engine has 340 hours and is reported to be ok.