John Morrison Posted February 20, 2021 Report Share Posted February 20, 2021 Whilst continuing the refurb of my 3A bonnet, before, 'Bondarusting', I find that both Dzus fixing holes are ovalised and too large, I would never get a secure fix. Plan is to, carefully, seam weld an infil plate from underneath, grind flush and then redrill round. Anyone see any issues with this, or is there a better way? John. Quote Link to post Share on other sites
Ian Vincent Posted February 21, 2021 Report Share Posted February 21, 2021 I wouldn’t bother with welding up and re-drilling the holes. I would try fitting the Dzus washers with epoxy before you clamp them up and remove the excess that squeezes out. Rgds Ian Quote Link to post Share on other sites
Lebro Posted February 21, 2021 Report Share Posted February 21, 2021 What are the other two holes for ? Bob. Quote Link to post Share on other sites
iain Posted February 21, 2021 Report Share Posted February 21, 2021 What about welding in a washer? Iain Quote Link to post Share on other sites
John Morrison Posted February 21, 2021 Author Report Share Posted February 21, 2021 17 minutes ago, Lebro said: What are the other two holes for ? Bob. Bob, I'm guessing that a PO, fitted those, of the time, locking bonnet pins that had a plate with four holes riveted to the bonnet, a pin coming up the from the inner wing, and was secured with a wired pin, all very rally like. Both sides actually have four holes. Iain, Might be a solution, if I used a washer with a large enough hole to accomodate the grommet, there wouldn't be enough metal to weld. Perhaps using a washer trimmed to suit my ovalled hole, (That can't be English?) with say a 5mm hole would make it easier to then enlarge to take the grommet? Ian, thanks Ian, but I was planning to have the bonnet painted and then fit the grommets, so probobly not th eexopy route, thanks anyway. John. Quote Link to post Share on other sites
Lebro Posted February 21, 2021 Report Share Posted February 21, 2021 You will probably be welding up the two smaller holes, so IMO you may as well start again with the Dzus holes. Just do some careful marking (a large cross) so you know exactly where to re-drill. Bob. Quote Link to post Share on other sites
Hamish Posted February 21, 2021 Report Share Posted February 21, 2021 I am afraid I fitted the bonnet pins on mine ( not many Marshall’s carry a carriage key. fits in the same hole in the bonnet and the pin in the inner wing directly under the dzus spring bracket fits . notation when I had louvres done thus repainted. Quote Link to post Share on other sites
Lebro Posted February 21, 2021 Report Share Posted February 21, 2021 Much more secure, I have been tempted that way myself, but have not to date. Bob. Quote Link to post Share on other sites
Hamish Posted February 21, 2021 Report Share Posted February 21, 2021 31 minutes ago, Lebro said: Much more secure, I have been tempted that way myself, but have not to date. Bob. Secure in that it won’t pop up but less safe parked up in that anyone could open it if they really wanted to. Quote Link to post Share on other sites
DesNoble Posted February 21, 2021 Report Share Posted February 21, 2021 Would the half grommet be sufficient to cover the ovality? I know it's slightly off subject but how do you compress the Dzus Half Grommet. I've tried with a nut and bolt but didn't have a satisfactory result. Des Quote Link to post Share on other sites
John Morrison Posted February 21, 2021 Author Report Share Posted February 21, 2021 Hi Des, unfortunately no, the ovality of the hole means it could never be secure. Re fixing the grommet, key is to use a countersunk bolt to,'Bell' the thing and a flat washer on top of the bonnet, reports indicate this works well. John. Quote Link to post Share on other sites
Ian Vincent Posted February 21, 2021 Report Share Posted February 21, 2021 47 minutes ago, John Morrison said: Hi Des, unfortunately no, the ovality of the hole means it could never be secure. Re fixing the grommet, key is to use a countersunk bolt to,'Bell' the thing and a flat washer on top of the bonnet, reports indicate this works well. John. Yep, countersunk bolt to start it going and then finish off with a regular bolt and flat washers. And I made sure that the final bolt was the same diameter as the dzus to ensure that the diameter of the hole wasn't reduced. Rgds Ian Quote Link to post Share on other sites
DesNoble Posted February 21, 2021 Report Share Posted February 21, 2021 Thanks guys it didn't occur to me to start it off with a countersunk bolt. I'll give that a try. Des Quote Link to post Share on other sites
foster461 Posted February 21, 2021 Report Share Posted February 21, 2021 That hole doesnt look too far off round, how about just adding a bead or two of weld on the elongated side and then grind it flat and use a file to make it round again ? Stan Quote Link to post Share on other sites
stuart Posted February 22, 2021 Report Share Posted February 22, 2021 15 hours ago, foster461 said: That hole doesnt look too far off round, how about just adding a bead or two of weld on the elongated side and then grind it flat and use a file to make it round again ? Stan Thats exactly what I have had to do before now, not easy but do-able. Stuart. Quote Link to post Share on other sites
foster461 Posted February 22, 2021 Report Share Posted February 22, 2021 I filled dozens of holes on my project using a bit of flattened copper pipe under the hole to help control the weld bead. In Johns case it doesnt even need to be that pretty as the alu gromet will cover it up. It just need to be closed up a bit to stop everything from moving. Quote Link to post Share on other sites
John Morrison Posted February 26, 2021 Author Report Share Posted February 26, 2021 On 2/21/2021 at 8:41 AM, iain said: What about welding in a washer? Iain Hi all, Thought you might like an update. So went in the end with Iain's suggestion of using a washer. The worst hole I made to fit from a larger repair washer with 1/4 inch centre, other side really only needed a smaller washer staright from the packet. No problem with the welding and all pretty straithforward really, Thanks for the contributions. John. Last picture shows holding coat of bondarust, over just the metal. Quote Link to post Share on other sites
Lebro Posted February 26, 2021 Report Share Posted February 26, 2021 Good job, well done. Bob. Quote Link to post Share on other sites
Hamish Posted February 26, 2021 Report Share Posted February 26, 2021 Great result. Quote Link to post Share on other sites
R.M. Posted February 26, 2021 Report Share Posted February 26, 2021 neat job. couldn't do better myself. Quote Link to post Share on other sites
iain Posted February 26, 2021 Report Share Posted February 26, 2021 Good effort John Iain Quote Link to post Share on other sites
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