Diesel sealant

[eagleye]

Hi all

i need some info on what is a suitable sealant for a reducing bush on

a diesel pump that's not going to be dissolved by the diesel

the pump is an electric refuelling type, not on an engine.

Thanks in advance

[cornish wood burner]

PTFE tape

[slack ma girdle]

PTFE tape

 

You won't get better

[Agi-Smash]

Parallel or tapered thread?

[eagleye]

Parallel or tapered thread?

 

won't know until i take it apart

can you give the options for both

thanks

[Agi-Smash]

Parallel thread, dowty seal or copper washer, no sealant.

Tapered thread, use a liquid, non hardening sealer, cant remember the number but i use a loctite product for diesel. Doesnt set so can be taken apart again. I am very weary of ptfe as it can break up when screwed together, have had hydraulic problems on a machine in the past and the velves were all jammed up with ptfe tape. I know this is on hydraulics but modern common rail diesels do not like any contaminants at all.

Hope this helps

[cornish wood burner]

Parallel thread, dowty seal or copper washer, no sealant.

Tapered thread, use a liquid, non hardening sealer, cant remember the number but i use a loctite product for diesel. Doesnt set so can be taken apart again. I am very weary of ptfe as it can break up when screwed together, have had hydraulic problems on a machine in the past and the velves were all jammed up with ptfe tape. I know this is on hydraulics but modern common rail diesels do not like any contaminants at all.

Hope this helps

 

Dowty is perfect when you have a shoulder as on hydraulic fittings but not all parallell threads have suitable shoulders especially on diesel fittings. Often liquid sealers weep slightly under pressure.

If you use PTFE tape make sure you wind the correct way so that when assembling you tighten the tape. Do not go over the end of the fitting. Do NOT leave old tape on the fitting. Clean first then use new tape.

[Agi-Smash]

Well added cornish wood burner.

[eagleye]

Thanks lads

all sorted now with PTFE as instructed