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1Back to top Go down   Is this a welch plug? Empty Is this a welch plug? Sat Jun 21, 2014 10:47 pm

hzbloke

hzbloke
active member
active member
The story so far: bought an '84 K100RT that had stopped running because of a faulty fuel pump. Fixed that. Ran it and the oil filled with water. So I overhauled the water/oil pump. Ran it again and the oil filled with water again. In a couple of minutes all of the water was in the oil. Drained the oil and found this:

Is this a welch plug? Welch1_zpsa08ea633

It's slightly domed, made of thin pressed steel and is corroded. There was no coolant and a fair bit of rust in the cooling system when I cleaned it out.

Is this actually from a K100 and, if so, from where? And, other than a blown head gasket, where else can the water find it's way into the oil?


__________________________________________________
84 K100RT
86 R65
52 Ariel VH500
    

2Back to top Go down   Is this a welch plug? Empty Re: Is this a welch plug? Sun Jun 22, 2014 3:08 am

k-rider

k-rider
Life time member
Life time member
did you replace the o-rings between the oil/water pump and the engine ?
also , there is a similar o-ring ,well 2 , between the oil sump(absorber gear housing), and the engine , that may be faulty

k-rider


3Back to top Go down   Is this a welch plug? Empty Re: Is this a welch plug? Sun Jun 22, 2014 7:45 am

Rick G

Rick G
admin
admin
There are expansion plugs in the cylinder head that are between the oil and water. You need to remove the cam chain cover and the cam cover to get at them.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

4Back to top Go down   Is this a welch plug? Empty Re: Is this a welch plug? Sun Jun 22, 2014 10:56 pm

hzbloke

hzbloke
active member
active member
Rick, you deserve the MVP award. I presume that this is the hole in the head behind the timing chain cover you meant:
Is this a welch plug? IMGP7019_zps3618abe4

The welch plug was completely gone. The middle bit I found the other day and the outer bit was sitting here:
Is this a welch plug? IMGP7022_zps80e0d93e

The two bits look like this:
Is this a welch plug? IMGP7024_zps8cba7c8e

A cheap and easy fix. I hope there's not too much collateral damage.

k-rider, thanks for the suggestion. I installed all of the o-rings that came in the Motobins pump kit. I know nothing about the absorber gear housing yet but I may be about to find out.

Thanks again.


__________________________________________________
84 K100RT
86 R65
52 Ariel VH500
    

5Back to top Go down   Is this a welch plug? Empty Re: Is this a welch plug? Sun Jun 22, 2014 11:39 pm

Rick G

Rick G
admin
admin
Take the front cover off the water/oil pump and make sure to get any scale out. The cover has no gasket and can be sealed by using Permatex RTV Red or 3 Bond and put the sealant on a very clean surface, put the cover on and lightly do the bolts up so the sealant spreads evenly then let the sealant set (1-2 hours) and tighten to 8-10ft/lb


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

6Back to top Go down   Is this a welch plug? Empty Re: Is this a welch plug? Mon Jun 23, 2014 3:50 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Those Welsh, they really take a hiding. Poor Taffies.

In Americaland they're called freeze plugs.


__________________________________________________
How we spend our days is, of course, how we spend our lives. - Annie Dillard, author - born 1945
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & one '98 K1200RS. The R100 Mystic, K11/12 Big Block, 2nd K1200RS, K1200R & K1300GT are running, rego'd & ridable.
    

7Back to top Go down   Is this a welch plug? Empty Re: Is this a welch plug? Mon Jun 23, 2014 9:48 pm

hzbloke

hzbloke
active member
active member
Ah Two-Wheels-Better, just like a lady's fun parts they go by many names. According to the infallible resource that is Wikipedia they are really a Core Plug. Or a Freeze Plug, or a Frost Plug or an Engine Block Expansion Plug. They're also known as Cup Plugs or Expansion Plugs.

But as they were invented by the Welch brothers of the Welch Motor Car Company I like to call them Welch plugs in honour of the Welch boys.

What you call a lady's fun parts (even in Welsh) is entirely up to you.


__________________________________________________
84 K100RT
86 R65
52 Ariel VH500
    

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