InfinityJon Posted August 28, 2020 Report Share Posted August 28, 2020 Right, when I had the block sorted, my engine man took all my core plugs out as requested unfortunately, I forgot to photograph which way the plugs went into the engine. Any chance a kind soul would tell me if the the plugs go in dish first or dish out. I can’t find a diagram to show me. if they are dish out, I get that flattening the dome seals the side flanges to the block but how does that work if they are dish in? Quote Link to post Share on other sites
Mike C Posted August 28, 2020 Report Share Posted August 28, 2020 Welsh plugs normally go concave face in - so that when you punch them with a drift they expand outwards and seal. Quote Link to post Share on other sites
Waldi Posted August 29, 2020 Report Share Posted August 29, 2020 Agree with Mike. That is the way they work. Waldi Quote Link to post Share on other sites
Motorsport Mickey Posted August 29, 2020 Report Share Posted August 29, 2020 (edited) 8 hours ago, Mike C said: Welsh plugs normally go concave face in - so that when you punch them with a drift they expand outwards and seal. To prevent protests from our members of Welsh extraction just to correct the spelling it's Welch with a c. Welch plug[edit] The Welch plug is a type of core plug that is made from a thin disc of metal. The Welch plug is dome-shaped and inserted into the casting hole with the convex side facing outwards.[5] When installed by striking the Welch plug with a hammer, the dome collapses slightly, expanding it laterally to seal the hole. This differs from other dish-shaped core plug designs, which form a seal when their tapered sides are pressed into the casting hole.[6] The Welch plug was originally designed in the 1900s at the Welch Motor Car Company in the United States. Prior to the invention of the Welch plug, the core holes were sealed using pipe plugs. During the testing of a car, one of the pipe plugs backed out. In order to get back on the road, one of the Welch brothers installed a press-fit quarter or half dollar coin into the hole using a hammer. The design of the Welch plug was refined based on this principle of a press-fit metallic disc.[7 The core plugs more often used on modern designs are of the "cap" type which are shaped with almost parallel short sides, and are referred to as core plugs without a generic name. Mick Richards Edited August 29, 2020 by Motorsport Mickey Quote Link to post Share on other sites
Mike C Posted August 29, 2020 Report Share Posted August 29, 2020 I never knew this-"The Welch plug was originally designed in the 1900s at the Welch Motor Car Company in the United States. Prior to the invention of the Welch plug, the core holes were sealed using pipe plugs. During the testing of a car, one of the pipe plugs backed out. In order to get back on the road, one of the Welch brothers installed a press-fit quarter or half dollar coin into the hole using a hammer. The design of the Welch plug was refined based on this principle of a press-fit metallic disc." I always thought the Welsh invented them, probably back in the days of Richard Trevithick. Quote Link to post Share on other sites
InfinityJon Posted August 29, 2020 Author Report Share Posted August 29, 2020 So the cup type go in cup bottom first and the dish type are in dome out Quote Link to post Share on other sites
BlueTR3A-5EKT Posted August 29, 2020 Report Share Posted August 29, 2020 35 minutes ago, InfinityJon said: So the cup type go in cup bottom first and the dish type are in dome out TR6 will probably have the cup type core plugs. If it looks like this it goes concave side out, as shewn. If it looks like this it goes domed face out which you then flatten to expand it into the recess. Cheers Peter W Quote Link to post Share on other sites
InfinityJon Posted August 29, 2020 Author Report Share Posted August 29, 2020 Thanks guys Quote Link to post Share on other sites
stuart Posted August 29, 2020 Report Share Posted August 29, 2020 1 hour ago, Mike C said: I always thought the Welsh invented them, probably back in the days of Richard Trevithick. He wasnt Welsh he was Cornish! https://en.wikipedia.org/wiki/Richard_Trevithick Stuart. Quote Link to post Share on other sites
RogerH Posted August 29, 2020 Report Share Posted August 29, 2020 Ah!! a Cornish plug from Stuart. Roger Quote Link to post Share on other sites
PodOne Posted August 29, 2020 Report Share Posted August 29, 2020 19 minutes ago, RogerH said: Ah!! a Cornish plug from Stuart. Roger Can't see a pasty lasting long! Quote Link to post Share on other sites
stuart Posted August 29, 2020 Report Share Posted August 29, 2020 20 minutes ago, PodOne said: Can't see a pasty lasting long! Not usually! Stuart. Quote Link to post Share on other sites
RogerH Posted August 29, 2020 Report Share Posted August 29, 2020 Cracking picture Grommet Roger Quote Link to post Share on other sites
Motorsport Mickey Posted August 29, 2020 Report Share Posted August 29, 2020 The eyes...the eyes...look into the eyes...you have no control...lift up the food...give it to ME ! Mick Richards Quote Link to post Share on other sites
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