| rradar | -- 01-24-2021 @ 3:29 PM |
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Looking for the sequence pattern of torquing head bolts down on my 40 Mercury Flathead. Thanks for your help!!
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| ken ct. | -- 01-24-2021 @ 4:56 PM |
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Work from the center out basic Mecanics knowlage. ken ct
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| nelsb01 | -- 01-24-2021 @ 6:20 PM |
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Do a Google search on "flathead torque specs" and you will find a picture to help
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| rradar | -- 01-24-2021 @ 7:57 PM |
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Did search and found bolt torque pattern. Slightly different sequence for 46-48 than 38 to 46. Probably because of change of water passage shapes . The application is 40 Mercury but the head has a cast "T" on one head so believe it is later vintage. Will just torque down using later pattern at 55-60 pounds. Thanks for a quick answer. Radar
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| TomO | -- 01-25-2021 @ 8:10 AM |
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I used the pattern from the Ford Shop Manual for the 38-46 24 stud heads shown on Van Pelt's site. http://vanpeltsales.com/FH_web/flathead_cylinderhead_torque-specs.htm The T cast in the head is the correct 1940 Mercury head P/N 81T 6049 and 81T 6050. You would need to rework the heads to provide valve clearance if you are using the heads on a 59 block. Tom
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| rradar | -- 01-25-2021 @ 12:47 PM |
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Thanks Tom--The heads are installed and are presently in use. My thought was to check existing torque for correctness. Did have second thoughts about the chance of breaking off a stud. Maybe better off not not inviting trouble. Had some minor coolant intrusion --thought maybe heads needed to be re torqued
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| TomO | -- 01-26-2021 @ 8:26 AM |
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There is little danger of breaking a stud if your torque wrench has been calibrated recently and you stick to the upper limit of 55 ft-lbs. Tom
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| sarahcecelia | -- 02-01-2021 @ 1:51 PM |
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Remember they get 60 pounds; ( if I remember correctly) BUT you first do all to 20 pounds, then to 40 pounds, then to 60 pounds; and then finally, go back once again and re-check them at 60 pounds. Later after running the motor; re-check them all for 60 pounds.That's the correct way to do torque on cylinder heads; and believe me, when I worked for VW, and later Buick; and went to their factory schools-that's what I learned about torqueing heads. Regards, Steve Lee This message was edited by sarahcecelia on 2-1-21 @ 1:55 PM
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| rradar | -- 02-03-2021 @ 9:33 PM |
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Thanks to all for helpful input. Will put it to use when possible Radar
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