Bosch VE pump shaft seal leak.

[Julian]

What's the stability of superglue in biodiesel? 

Very good question.  It was all I had to hand and needed to get the car back on the road.

In reality only a minuscule edge of the superglue will see bio and the area of super glue across the depth of the seal in comparison is enormous.

I think a similar principle applies to Nitrile 'O' rings.  I've had  'O' rings sealing pumps running on bio and they've been fine for years.

Time will tell!

[julianf]

Julian,

How come the seal came out (ie how come it needed the glue)

I have not seen inside, but im surprised the design of the unit does not keep it in place.  Im mostly wondering why yours came out, when all the others seem to stay in place?

[Julian]

Julian,

How come the seal came out (ie how come it needed the glue)

I have not seen inside, but im surprised the design of the unit does not keep it in place.  Im mostly wondering why yours came out, when all the others seem to stay in place?

The only thing I did any different was to put a smear of silicone where the mark in the housing was ... but I don't think that would have been the cause.  Other than that I've no idea.

It's not an ideal design.  If the seal sees pressure, it should really be inserted from the inside.  I did consider making a collar then tapping and drilling the body to hold it in place ... there's room between the body and flange, but it would be rather long winded and quite difficult with the shaft in place.