E2M2 making intermittent grindng noise

[MSCHemist]

The Foreline pump (E2M2) is working fine but intermittantly it makes a very loud grinding noise that seems to be coming from the fan area that goes away after a few seconds. It sounds like a bearing is failing. It is very loud and driving me crazy. I am looking at the exploded parts diagram but can't figure out what part needs to be replaced and how to attack it.

I checked and replaced the oil it looked fine, a bit yellow but nothing suspended in it.

[MSCHemist]

I've determined it lost the headless bolt from the motor coupling and fan assembly. Trying to figure out how to get it back.

[LALman]

Mine which was old back in 2001 began making a periodic grinding noise and it turned out to be the motor bearings. They were letting the plastic fan on the coupler grind against the case. I got the motor rebuilt and that took care of it.

[MSCHemist]

I think I fixed it. I took the entire coupler/fan off, cleaned the pad, got some silicone down the motor shaft and put it back together. It has been fine since. I think some gritty oil got in there. It leaks a very minute amount from the oil tank gasket.

I had an old E2M1.5 lying around that I took apart. Not as bad to service as I thought. The exploded parts diagram looked scary but there were only a handful of really lose parts when I took apart the modules.

[James_Ball]

Glad you got it working well again. I have yet to do anything to an E2M2 except change oil even on the ones that are 30 years old and they only weep a few drops per month. I have an RV5 that is a few years old and leaks like the Titanic, gonna try to replace the tank seal on it soon, wish me luck.