FEL-PRO BS 40644 Engine Crankshaft Seal Kit for Ford F-150

Dry fit, no prelube or grease. So far no leaks! Felpro is always pretty great!

For such an important install to get right the first time, there are practically no instructions/illustrations available. My vehicle is a 2000 F150, 5.4 2V L. The pictures pretty much say it all.**Updated: Aug 17,2023 - Still No Leaks!1.) PTFEMake sure you clean the crank off with alcohol. PTFE is a tight lip seal, no spring. The install is dry, no oil or grease allowed. I plan on using a little RTV on the outside but I also read that some grease is allowed to facilitate install. NOT on inside, only outside. Supposedly, the lip of the seal has some type of Teflon material that binds with the crank sometime after initial start.2.) Seal flaring tool:The purpose of the plastic cup is to stretch the lip/inner seal a bit during the dry install. After moving the seal over the hump/flare, past the plastic expansion tool, the seal should relax over the crank once reaching the final position. It you don't use the flaring tool you risk rolling the lip backwards (toward flywheel).3.) Installation:As far as seal depth goes, I am going to set it flush with the outside of the cover...1/4 inch back from outside of where flywheel connects to the crank. The old seal set contained a second, factory 'slinger' seal, but read that it is not necessary to re-install. The new seal contains a smaller, outer lip that prevents debris intrusion. The aluminum housing was pulled to get both the slinger and the rear main out (probably not necessary, just a pain to get the seals out). I installed (no gasket existed, used rtv) the cover a few days before setting the seal. On YouTube, there are some videos with people installing the seal into the cover before the cover was attached to the engine...that didn't make too much sense to me. The plate needs special care since you need to use RTV.BTW: I went to Lowe's and purchased a PVC cleanout plug to install the seal, 4", I think. It worked great. Here is a similar product: https://smile.amazon.com/Genova-71840-products/dp/B000BPD95W/ref=sr_1_2?keywords=4%22+PVC+Threaded+Plug&qid=1575852340&sr=8-2

I used this on a 2002 F150, 5.4L 206K miles. While servicing the transmission, went ahead and changed out the rear main seal. Came with a plastic sleeve to aid in sliding it over the crank end. Sure glad I did, there's a lot going on while putting the seal retainer plate on the dowels, last thing I need to worry about is folding the seal lip, this eliminates the worry. Cleaned up the crank end as suggested, nice and dry before installing (according to the instruction sheet). Also, seems like this one is a step-up in rubber technology, it's PTFE and is supposed to be better according to Fel-Pro website. Got a few hundred miles on it so far, no leaks in sight. So, this looks like a good choice for the extra couple dollars versus the standard rubber one, I am pleased.

Well I didn’t have this part on my radar. It was suggested that other customers bought this part with the clutch kit I ordered. This was another part I could replace while I had the transmission dropped. I never installed this part before. Thank God for YouTube. It was an exact fix.

This one piece rear main seal (Ford 5.0L casting from 1983 forward) can be installed without a driver if you loosen the rear main bearing cap just a little, then torque it back down. I did that and haven't had any leaks on my new engine build.

Good stuff

Very nice at a great price

seal failed after 28 months about 15K miles, installation was professionally done.