Sump Drain Plug

[myoldjalopy]

Here's an easy one for someone - is the sump drain plug meant to have a (copper?) washer?

[philthehill]

Straight answer - Yes. Pt No: 6K638 (MOSS).
It is the crushable type and should be replaced every time the sum plug is removed.
Phil

[Bluevan]

As above, but if you don't have one handy, PTFE tape run two or three times around the plug thread will hold it oil-tight indefinitely until you can fit the correct item

[myoldjalopy]

Thank you both. I will get one next oil change time

[bmcecosse]

Yes it should have copper washer - again - I've never had to change one and no leaks. Don't overtighten! And NO ptfe tape.... Worry more about the oil filter - make SURE the plate and spring are present and correct under the paper element filter.

[oliver90owner]

All parallel threads require a washer. Most, but not all tapered threads use some form of leak avoidance - hemp, tape or sealant. Non-pressurised tapered thread joints may not need extra help to avoid leakage. Not using the correct washer can lead to loosening of the fitting. Losing your engine oil is not a good idea and not worth risking. Some sump plugs use flat washers which can be re-annealed. I recommend the makers instructions are followed for the particular installation as some plugs have tapered contact faces. Perhaps someone can post the form used in minor engines?

[myoldjalopy]

Thank you gentlemen - most illuminating. Here is the plug......... parallel thread: http://www.morrisminorspares.com/engine ... ug-p830320

[philthehill]

Later screw on filter heads with the parallel threaded union do not have a washer of any sort fitted under the union head even though both the filter head and the union have machined faces.
I have found that a Dowty washer is a must in this situation.
Phil