Oil gallery plug fitting

Engine Oily Bits, Ignition, Fuelling, Cooling, Exhaust, etc.
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Llessur
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Oil gallery plug fitting

#1 Post by Llessur » Wed Mar 31, 2021 8:31 pm

Any advice?

I'm currently rebuilding my 2500 lump and have all the necessary plugs from Chris Witor - the old ones were removed by the machine shop.

Do they go in dry? With Loctite? With RTV?

Are they supposed to be a tight fit? Do they bottom out, or do I just drive them in a certain depth and leave it at that?

The large one at the end behind the backplate feels quite tight going in - almost like it's cross-threading but Chris Witor's stuff is normally right for the job so maybe this is just how they are? Threads seem clean and in good condition.
Adelaide, South Australia (ex-Brighton, UK)
1977 2500S - White

My 2500 blog: https://triumph2500blog.wordpress.com/

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Alec
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Re: Oil gallery plug fitting

#2 Post by Alec » Thu Apr 01, 2021 6:01 am

Hello LLessur,

they are tapered pipe plugs (NPT I think?) and should seal dry. However I would use a modern liquid thread sealer as a belts and braces approach.
I did not follow my own advice and recently had to remove my rebuilt engine (Twice, as I blamed it on the rear oil seal which it wasn't) as the rear gallery plug behind the back plate was leaking.

Alec
0465

MK1.5 2.5 P.I.
Jaguar MK 2 (Long term restoration.)
Hymer 564 Motorhome.

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Llessur
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Re: Oil gallery plug fitting

#3 Post by Llessur » Thu Apr 01, 2021 6:18 am

Thanks Alec, very helpful. I'll grab some thread sealer :D

Do they definitively bottom out or do they just need to be done up until tight/flush with the block etc?
Adelaide, South Australia (ex-Brighton, UK)
1977 2500S - White

My 2500 blog: https://triumph2500blog.wordpress.com/

User avatar
Alec
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Posts: 2434
Joined: Sat Feb 07, 2004 7:23 pm
Location: Oswestry, Shropshire

Re: Oil gallery plug fitting

#4 Post by Alec » Thu Apr 01, 2021 8:17 am

Hello LLessur,

yes, the tapered thread just jams tight, not to a specific depth, depending on the tolerance of the tapping and the plug. So some liquid seal and screw in tight.

Alec
0465

MK1.5 2.5 P.I.
Jaguar MK 2 (Long term restoration.)
Hymer 564 Motorhome.

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