WebbR Posted November 22, 2022 Share Posted November 22, 2022 Good day, gentlemen! I have a potentially big problem with my throttle body. While cleaning it, I removed the molybdenum coatings and I really want to fix this issue and not discard the throttle body as a whole. I have purchased some molybdenum disulfide, only to find that it has to be dilluted with another unknown compound to be able to use it. I found a video on YT with someone sealing a carburettor butterfly valve with some compound he says it's really hard to find, called DHE213...google search shows no relevant infos. Can someone enlighten me and others who made this mistake? Thanks in advance! Zoltan Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted November 22, 2022 Member Contributer Share Posted November 22, 2022 Why bother ? The coating it jjst to stop corrosion. Degrease & paint with alloy etch primer & a top coat. Link to comment Share on other sites More sharing options...
Member Contributer Grum Posted November 22, 2022 Member Contributer Share Posted November 22, 2022 2 hours ago, Mohawk said: Why bother ? The coating it jjst to stop corrosion. Degrease & paint with alloy etch primer & a top coat. No Sir. The coating is there to seal the butterflies when closed. If the coating is damaged or removed greater bypass air increases idle speed which the starter valves can't properly compensate for. End result is high uncontrollable idle speed. The one person I've heard that experienced this had to replace the whole throttle body if I remember correctly! Makes you wonder if there might be some specialist engineering business out there that could professionally repair or replace the Molybdenum Coating?? Link to comment Share on other sites More sharing options...
Member Contributer Terry Posted November 22, 2022 Member Contributer Share Posted November 22, 2022 Mr Google found me a Patent application for a novel form of application equipment for the moly coating, but had the following words: "Over time, during use of the fuel system, a carbon-based sludge seal will form between the plate member and the wall member to close the annular gap. This seal will be formed by the fuel system component byproducts. If this seal is allowed to form during the use of the fuel system, the amount of air introduced, and thus, the operating conditions of the fuel system, will have varied overtime. Accordingly, it is desirable, and has been industry practice, to form a seal in the throttle body assembly to cover the annular gap during production of the throttle body assemblies to provide a throttle body assembly which can have continuous and stable use. Typical sealant compositions comprise a Molybdenum disulfide/MEK solution, such as Molydag® from Acheson, which is further diluted with an additional 10-20 weight percent of MEK." Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted November 27, 2022 Member Contributer Share Posted November 27, 2022 I thought he said he lost the coating from an avid bath some such so no loss of material. Over bored throttle bodies work just fine in bare alloy & as the VFR does not rely on the throttle plate for idle speed control due to the starter valves (that is what leads to the snatch off idle) either way I don't believe that coating is required. Alternately buy a second hand set of TB's they are cheap enough. Link to comment Share on other sites More sharing options...
WebbR Posted December 7, 2022 Author Share Posted December 7, 2022 On 11/23/2022 at 1:40 AM, Terry said: Mr Google found me a Patent application for a novel form of application equipment for the moly coating, but had the following words: "Over time, during use of the fuel system, a carbon-based sludge seal will form between the plate member and the wall member to close the annular gap. This seal will be formed by the fuel system component byproducts. If this seal is allowed to form during the use of the fuel system, the amount of air introduced, and thus, the operating conditions of the fuel system, will have varied overtime. Accordingly, it is desirable, and has been industry practice, to form a seal in the throttle body assembly to cover the annular gap during production of the throttle body assemblies to provide a throttle body assembly which can have continuous and stable use. Typical sealant compositions comprise a Molybdenum disulfide/MEK solution, such as Molydag® from Acheson, which is further diluted with an additional 10-20 weight percent of MEK." Thank you so much for providing such interesting information, sir! I really don't want to buy another TB just for this problem, despite that it's getting a costly procedure already, since I already bought a few quite pricey stuff to unsuccesfully remediate the problem. I bought some molybdenum powder, which proved worthless till now, because at first I didn't know it's a powder, but now I'm interested if I can use that to dilute with that MEK solvent..please elaborate that part, if you can. What does 10-20 weight percentage mean? For example for a few grams of moly powder needed, I only need 10-20 % of MEK to dillute it with? Thank you! Link to comment Share on other sites More sharing options...
Member Contributer DannoXYZ Posted December 8, 2022 Member Contributer Share Posted December 8, 2022 Not likely it'll dissolve. You can test it. Powder is meant to be mixed with binder. Probably some epoxy paint base perhaps. Or Cerakote. Link to comment Share on other sites More sharing options...
Member Contributer Terry Posted December 9, 2022 Member Contributer Share Posted December 9, 2022 On 12/8/2022 at 6:29 AM, WebbR said: Thank you so much for providing such interesting information, sir! I really don't want to buy another TB just for this problem, despite that it's getting a costly procedure already, since I already bought a few quite pricey stuff to unsuccesfully remediate the problem. I bought some molybdenum powder, which proved worthless till now, because at first I didn't know it's a powder, but now I'm interested if I can use that to dilute with that MEK solvent..please elaborate that part, if you can. What does 10-20 weight percentage mean? For example for a few grams of moly powder needed, I only need 10-20 % of MEK to dillute it with? Thank you! The original text said: "Molydag® from Acheson, which is further diluted with an additional 10-20 weight percent of MEK". The way I read this is that the Molydag is a paste that is a bit too thick for easy application so methyl ether ketone is added to dilute it and make it a bit more fluid. The mix would then be something like 90% Molydag and 10% MEK by weight. Link to comment Share on other sites More sharing options...
Member Contributer DannoXYZ Posted December 9, 2022 Member Contributer Share Posted December 9, 2022 https://www.coatresa.com/en/acheson-molydag-coating/ Link to comment Share on other sites More sharing options...
Member Contributer ShipFixer Posted December 9, 2022 Member Contributer Share Posted December 9, 2022 I hope to never have to do whatever is being discussed here 🤣 Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.