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      04-22-2019, 08:01 AM   #73
mweisdorfer
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Drives: 2007 Black/Black 335i e90
Join Date: Apr 2011
Location: Holly, MI

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2007 BMW E90 335i  [0.00]
2008 bmw x5  [0.00]
A must for this DIY

so, I learned a little something this weekend. You can run the car with out the harmonic balancer on (no belt), as long as you have a least a 30v battery charger/ maintainer. A 60v would be ideal.

I did just that. It did this to see exactly where the leak was coming from in the front crank shaft seal. Low and behold it was coming from inside the seal. The outside & especially where the key holes are on the seal were perfect.

So, I couldn't remember if I oiled the crank or not the last time I did this seal. I made sure that I lightly oiled the crank with a Q-tip several times, and installed the new seal. You MUST do this or the seal might buckle on the inside when you are pushing it in. Putting a rubber seal in Dry, in that tight of an area, is a bad idea and was probably my mistake.


I put a bead of Ultra Grey in the key slots and around the entire seal and let it set up for maybe 15 min. I then used the tool to slowly push the seal in. I took the tool off the crank and then put a good bead of ultra grey around the entire seal like I was caulking a window or door. I even used the little blue caulking tool you can get at HD or Lowe's, so you can get a perfect seal and look all the way around. The key with a product like Ultra Grey is that it's Engineered specifically for car parts that vibrate (cranks). You also, MUST wait 24 hours before you start the car up after you have the new seal in.

Last, I ran the engine like before without any belt on to see if it would leak. No leaks!!!!!! I put her back together and then ran it again for a good 20 min or so and made sure the oil temp hit 200 degrees. No leaks !!!!!
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