went to take the mini out today and noticed water
dripping out of the centre front welch plug.
question is should I change just this one plug or all three
and is there only three plugs on this engine as I can't see any more
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| Author: | mini_me [ Fri Apr 08, 2005 2:02 pm ] |
| Post subject: | welch plugs |
went to take the mini out today and noticed water dripping out of the centre front welch plug. question is should I change just this one plug or all three and is there only three plugs on this engine as I can't see any more
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| Author: | drmini in aust [ Fri Apr 08, 2005 2:54 pm ] |
| Post subject: | |
On a 998 Deluxe there are 4 welch plugs- 3 on front and one hidden above the flywheel housing, behind the steady bar. Get brass ones, they last good. 
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| Author: | J_A_M [ Fri Apr 08, 2005 3:04 pm ] |
| Post subject: | |
there is more than 3... i think there is 1 or 2 under either the timing cover or clutch housing or both....the boffins will know. 
edit...ok it took me more than 10 minutes to write that...one such boffin got to it before me.... 
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| Author: | 68matic [ Fri Apr 08, 2005 6:09 pm ] |
| Post subject: | |
what do the welch plugs do? |
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| Author: | gafmo [ Fri Apr 08, 2005 6:12 pm ] |
| Post subject: | |
They stop water flowing out and air flowing in Sorry
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| Author: | aaron [ Fri Apr 08, 2005 6:12 pm ] |
| Post subject: | |
They hold the water in 
Cheers Aaron |
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| Author: | Morris 1100 [ Fri Apr 08, 2005 6:48 pm ] |
| Post subject: | |
They leak at the worst possible moments.
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| Author: | drmini in aust [ Fri Apr 08, 2005 7:26 pm ] |
| Post subject: | |
They really have 2 purposes: 1. They are there to allow the sand cores to be removed after the iron engine block has been cast in the foundry. 2. In freezing climates, if the water freezes overnight and then expands (as it's ice) in the block, the plugs will dislodge and relieve the pressure. They are called `freeze plugs' in the US for this reason.
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| Author: | 68matic [ Fri Apr 08, 2005 9:15 pm ] |
| Post subject: | |
do they dislodge completely or do they just move out a little and when the water melts you tap them back in? |
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| Author: | drmini in aust [ Fri Apr 08, 2005 9:17 pm ] |
| Post subject: | |
68matic wrote: do they dislodge completely
or do they just move out a little and when the water melts you tap them back in? I dunno, I've never seen it happen. Not much block icing here in Oz, man.. I suspect you would buy new ones. 
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| Author: | 9YaTaH [ Fri Apr 08, 2005 10:30 pm ] |
| Post subject: | the holes ...the holes... |
drmini in aust wrote: They really have 2 purposes:
1. They are there to allow the sand cores to be removed after the iron engine block has been cast in the foundry. 2. In freezing climates, if the water freezes overnight and then expands (as it's ice) in the block, the plugs will dislodge and relieve the pressure. They are called `freeze plugs' in the US for this reason. 1. its the holes cast around the sand cores that the Welsh Plugs are filling ... 2. come to Canberra in July nah only jokin.....
to answer the question above...if one has gone the chances are the lot are dodgey....get a suitable screwdriver in the centre of the plug, when I nod my head...you whack it with a hammer  (not too hard)
when the screwdriver neatly pierces the plug...carefull waggle it around until the plug comes out clean out the hole 
drift a new welsh plug in using the correct size socket... Doc do you use any sort of sealant or goop??? |
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| Author: | drmini in aust [ Fri Apr 08, 2005 10:38 pm ] |
| Post subject: | |
I used to use Stag, (got for nix) now I just bung a bit of Aviation gasket cement in there. Loctite 515 is good too.
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| Author: | 9YaTaH [ Fri Apr 08, 2005 10:43 pm ] |
| Post subject: | old hands.. |
drmini in aust wrote: I used to use Stag, (got for nix) now I just bung a bit of Aviation gasket cement in there. Loctite 515 is good too.
Thanking due
I distinctly remember one old mech putting a thin smear of grease on em to make the suckers easier to drift in.... |
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| Author: | gafmo [ Fri Apr 08, 2005 11:08 pm ] |
| Post subject: | Re: the holes ...the holes... |
9YaTaH wrote: when I nod my head...you whack it with a hammer I love that Line
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| Author: | danidad [ Sat Apr 09, 2005 2:03 am ] |
| Post subject: | |
yep they can come right out with the expansion of the ice.. the one on the back of the holden heads is a real pain to replace..Im talking old 186 here.. Ive even seen cars with hermetic ellements in the sump to keep the oil warm thus stopping water freezing. they then have to be plugged to the power when parkeds for the night....dont think you'd want to loctite them in if you ever go anywhere real cold like a ski holiday.. have used grease b4 |
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