Valve cover sealant

[b0y37]

I just had the valve cover and half moon gasket of my 4d56 replaced yesterday due to oil leak. Only to find out the leak worsened when I got home.

I suspect that the mechanic used a wrong type of sealant (Pioneer black rtv silicone - Republic Chemical Industries Inc. - Pioneer Adhesives, Epoxies and Resins - Mighty Gasket ). If this is the culprit, whats a good gasket sealant?
Also, whats the proper way to install the gasket? Just a dab of sealant on the edges or put sealant on the entire edge/groove of the valve cover?

TIA.

[crazy_boy]

AFAIK, edges lang dapat. Try copper gasket sealant. Madami sa Concorde niyan.
Good for sealing daw yung copper.


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[vinj]

Did the mechanic retorque all the bolts properly as well?

[Flipo]

I had just done the same procedure with my Toyota 2C, due to oil leak from valve cover. I thought it needs a retourqe, but the mechanic said it needs only to reseal the gasket. When he opened the cover, I noticed that the seal was already pressed down, and without any springy action, and the bolt is made of aluminum, and obviously does not need torque as it will break if more pressure is applied. The mechanic just made a good clean up of the edge (he did not remove the old seal/gasket) and applied Loctite Superflex White RTV (the drawing on the package suggest that it is used for flange), and retighten the bolt normally. It is almost a week now and the leak is gone.

In my opinion even red or black RTV sealant, the one used for oil pan will be sufficient as there is no high pressure in the overhead cam of my 2C engine; I don't know in your case.

[b0y37]

Did the mechanic retorque all the bolts properly as well?

I assumed sir. I'm not sure if they used the proper torque though. I just assumed since the mechanics are Mitsu experts (El Dorado). Im thinking I made them use the wrong sealant (my own spare).

[b0y37]

AFAIK, edges lang dapat. Try copper gasket sealant. Madami sa Concorde niyan.
Good for sealing daw yung copper.


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Thanks. Have you had experience using this sir? Id like to get one before I get home. Madali lang naman pala iDIY.

[crazy_boy]

Thanks. Have you had experience using this sir? Id like to get one before I get home. Madali lang naman pala iDIY.

my mechanic used the copper spray gasket for the cylinder head gasket of my car before. according to him, "lumalapat" daw ng mabuti yung copper sa sulok sulukan thats why its good.

[testament11]

Hmmm, baka konti ang nalagay na sealant nung mekaniko or nagkamali ng paglagay ng sealant yun mekaniko. Nagpalit na ko ng valve cover once by myself at tama yun sabi ni CB na dapat edges lang. Di kelangan sobra kapal nun sealant pero di naman dapat sobrang nipis at dapat evenly spread at dapat ma-seal yun within 3 minutes after application, at dapat, malinis na malinis yun papatungan ng valve cover gasket. Ginamit ko lang na silicon gasket eh yun Pioneer RTV na pula.

[b0y37]

Hmmm, baka konti ang nalagay na sealant nung mekaniko or nagkamali ng paglagay ng sealant yun mekaniko. Nagpalit na ko ng valve cover once by myself at tama yun sabi ni CB na dapat edges lang. Di kelangan sobra kapal nun sealant pero di naman dapat sobrang nipis at dapat evenly spread at dapat ma-seal yun within 3 minutes after application, at dapat, malinis na malinis yun papatungan ng valve cover gasket. Ginamit ko lang na silicon gasket eh yun Pioneer RTV na pula.

Minimal lang din yung nilagay nung mekaniko. Valve cover --> gasket ---> sealant on the edges.

Hindi na rin nya nilagyan ng sealant yung paligid nung makina. Pero ang na-notice ko, nasa bandang likod yung leak, bandang sa half moon.
Hmm.. mukhang mali ata yung sealant na pinagamit ko. I made him use the black one. Though I dont think na aabot naman ng > 200 deg C aabot yung temp ng makina, kaya pa rin dapat nung Pioneer RTV na itim?

[Chinoi]

Mas prefer ko yun RTV sealant either Red or Black. Pero dapat tangalin lahat ng old sealant linisan surface ng cylinder head and cover. Wipe off oil using kerosene or carb cleaner before applying thin layer of sealant. Hindi kasi maganda kapit ng sealant kapag may oil.
Hindi na rin ako gumagamit ng torque wrench sa paghigpit sa mga bolt kung dati nabubuksan ang valve cover.

[testament11]

Minimal lang din yung nilagay nung mekaniko. Valve cover --> gasket ---> sealant on the edges.

Hindi na rin nya nilagyan ng sealant yung paligid nung makina. Pero ang na-notice ko, nasa bandang likod yung leak, bandang sa half moon.
Hmm.. mukhang mali ata yung sealant na pinagamit ko. I made him use the black one. Though I dont think na aabot naman ng > 200 deg C aabot yung temp ng makina, kaya pa rin dapat nung Pioneer RTV na itim?

Ok lang yun RTV na itim. Ang tanong lang dyan kasi ay kung lapat na lapat yun pagkakalagay niya ng sealant at kung malinis yun paglalagyan ng half moon. Check mo na rin yun bolts kung mahigpit talaga yun pagkaka-screw. Pag mahigpit naman, then double check nalang yun pagkakalagay ng mga gasket

[johnjoseph]

I used Sure Grease when I replace the valve head cover ng 4AFE ko, natunaw lang yun mga excess sa edges, more than a month na, wala naman oil leak.

[lowslowbenz]

Technically, one does not need RTV sealant when replacing a valve cover rubber gasket. The valve cover gasket supplied to most engine models is usually made of rubber. Rubber performs the sealing aspect here. Proper torque on the bolts/nuts is necessary so that the valve cover clamps down evenly on the gasket, creating a good seal.

That is the same as when replacing an oil filter, one does not use RTV sealant sa oil filter rubber o-ring di ba?

[Mile2]

Okay lang yung Pioneer Black Silicon, yan din naman ginamit ko sa valve cover ng Innova, no leaking almost 2 years na. Dapat lang talaga malinis yung surface at hindi pinatatagal ang pagbalik at tighthening and also observe curing time.

[Chinoi]

Kaya naglalagay ng sealant dahil yata pag luma na rubber seal ng valve cover at matigas na ito. Hindi na maganda ang sealing.

[Flipo]

Kaya naglalagay ng sealant dahil yata pag luma na rubber seal ng valve cover at matigas na ito. Hindi na maganda ang sealing.

tama at ganito nga yung nangyari sa engine ko, and I forget to mention yung curing time (1 hour sa akin), as mentioned by Mile2

[Chinoi]

Ang ginagawa ko naman ay after applying ng RTV sealant ay antay ko matuyo ng konti for 5 minutes bago ko ilagay ang valve cover. Para tumigas konti or kumapal baka sakaling tumibay. Takot na ako mag higpit todo ng mga bolt. Nag loose thread ako dati. Curing time 1 hour din.

[b0y37]

Try ko i-diy mamya yung pagreplace ng gasket. Bumili na rin ako ng mas higher temp (red) na pioneer rtv silicone. I'll take note on your suggestions. Thanks all.

[testament11]

Technically, one does not need RTV sealant when replacing a valve cover rubber gasket. The valve cover gasket supplied to most engine models is usually made of rubber. Rubber performs the sealing aspect here. Proper torque on the bolts/nuts is necessary so that the valve cover clamps down evenly on the gasket, creating a good seal.

That is the same as when replacing an oil filter, one does not use RTV sealant sa oil filter rubber o-ring di ba?

Yup. Yan din sabi ng erpats ko. Once na may oil, no need for silicone gasket dahil enough na daw ang o-ring to seal it completely. Kaso sa case ko, pinakita ko sa erpats ko yun service manual na naka-indicate, needed ang sealant. Sabi ng erpats ko eh bakit ganun daw. Sabi ko lang, sundin nalang yun service manual

[testament11]

Try ko i-diy mamya yung pagreplace ng gasket. Bumili na rin ako ng mas higher temp (red) na pioneer rtv silicone. I'll take note on your suggestions. Thanks all.

Sir, dapat original half moon at gasket bilhin mo ah.