Clamshell torques? (Clymer strikes again!)

[9D280]

OK, I have contradicting info in Clymer. Torque values for the Inlet (aka Transfer) Port Cover says I should use 160 in-lbs. Makes sense - there are other same size bolts on other covers use that value. It then tells me the fuel pump should be installed using a torque of 70 in-lb. Fair enough.

Problem is the three screws that hold the fuel pump on also hold down that corner of the transfer cover!

Can any of you Merc gurus with a decent manual clarify what to do with the fuel pump screws? I am guessing 160in-lb on grounds that the sealing of the intake is kind of important , but a quick confirmation would bre appreciated.

I am also assuming the torquing sequence is similar to the other covers - namely start in the middle & work out?

Thanks.

[T 15]

Originally Posted by 9D280

OK, I have contradicting info in Clymer. Torque values for the Inlet (aka Transfer) Port Cover says I should use 160 in-lbs. Makes sense - there are other same size bolts on other covers use that value. It then tells me the fuel pump should be installed using a torque of 70 in-lb. Fair enough.

Problem is the three screws that hold the fuel pump on also hold down that corner of the transfer cover!

Can any of you Merc gurus with a decent manual clarify what to do with the fuel pump screws? I am guessing 160in-lb on grounds that the sealing of the intake is kind of important , but a quick confirmation would bre appreciated.

I am also assuming the torquing sequence is similar to the other covers - namely start in the middle & work out?

Thanks.

what year is ur 60 Merc.

[T 15]

does this help, Merc manual for 3 cyl 50hp, 60hp & 70 hp, & covers

Belgium No 9135825 > 9392276
Australia No 8042350 > 8074512
Canada No 7087823 > 7208333
USA No 4571652 > 6428681

[9D280]

T-15,

Thanks, that looks like where Clymer got their info from! (same numbers, same contradiction)

The fact that it specifies a fuel pump screw size as 1/4" and the transfer port as 5/8 makes me think again that I go for the full 160in-lb, as my fuel pump is held down by three 5/16" screws that continue through the cover below to the block and also hold down the bottom corner of the transfer port cover.


My engine is of unknown (and now mixed) vintage. I am trying to narrow it down based on the part numbers I've found stamped on things, but so far the best I can come up with is it's a 650 as opposed to a 60. I can't find the part numbers on any online thing (possibly as they are now NLA), either that or I have found the "as cast" part number.....

If it's any help to identify it,

Block - 865-8861 (bad casting, the last "1" may be a 7)
Transfer cover - 99522
Head water jacket - 1025-8563
Exhaust cover - 74214 (Exhaust baffle seems to have carried right through)

[T 15]

Originally Posted by 9D280

T-15,

Thanks, that looks like where Clymer got their info from! (same numbers, same contradiction)

The fact that it specifies a fuel pump screw size as 1/4" and the transfer port as 5/8 makes me think again that I go for the full 160in-lb, as my fuel pump is held down by three 5/16" screws that continue through the cover below to the block and also hold down the bottom corner of the transfer port cover.


My engine is of unknown (and now mixed) vintage. I am trying to narrow it down based on the part numbers I've found stamped on things, but so far the best I can come up with is it's a 650 as opposed to a 60. I can't find the part numbers on any online thing (possibly as they are now NLA), either that or I have found the "as cast" part number.....

If it's any help to identify it,

Block - 865-8861 (bad casting, the last "1" may be a 7)
Transfer cover - 99522
Head water jacket - 1025-8563
Exhaust cover - 74214 (Exhaust baffle seems to have carried right through)

1976 was the last year for the Merc 650

[T 15]

for the older ones

dates on pages for 1 & 2





1975 > 1978

[9D280]

Wow, thanks.

Is the Transfer cover on the 73/74 one a typo, or did they experiment with Loctite for a year? That seems incredibly low at 60 in-Lb, especially when for the rest of the production run (and the subsequent 60) it seems to be a constant 160 in-lb.

If it was a dabble with thread lock, I am probably safe to run with 160 in-lb, as the screws show no sign of any compound on the thread roots.

[T 15]

Originally Posted by 9D280

Wow, thanks.

Is the Transfer cover on the 73/74 one a typo, or did they experiment with Loctite for a year? That seems incredibly low at 60 in-Lb, especially when for the rest of the production run (and the subsequent 60) it seems to be a constant 160 in-lb.

If it was a dabble with thread lock, I am probably safe to run with 160 in-lb, as the screws show no sign of any compound on the thread roots.

sorry dont know if it a typo or not......in manual it says torque to specifications & in sequence.

7


6 6

4 4

none 2

1 1

3 3


5 5 5



does this look like ur's ?

sorry, me away to boat now...hope to do some ribbin on Lough Erne.

[9D280]

Hi, Yeah, almost!

If one of those 5s is on the fuel pump, and is slightly higher than the other two, then yes, it;s mine. It looks like Merc have a fairly standard torquing arrangement for big flat surface joints- Start i nthe middle & work outwards. I dont have it to hand here, but mine looks a bit like:


--O---------O


O
-------O-----O
O


O------------F
-------O---------F
O------------F


--O---------O

But longer & thinner. "F" are the Fuel pump mount holess (i.e longer screws) The two in the middle are on the separating "dams"

Have a good blast - I'm off to commune with my Torque wrench again!


Edit: The dashes are "spacers" to stop it all crunching up against the left hand side. What happened first save was about as much use as a chocolate fireguard!