alt
Well-Known Member
As above, can anyone remember? Thought I got the info before but can't remember where from or what the spec was!
KAD300 - Torque (Nm) of exhaust manifold studs / bolts?
- Thread starter alt
- Start date
BruceK
Well-Known Member
Unless otherwise stated the torque settings for each size of bolt is given right in the front of the workshop manual concerned (Engine Body IIRC). I am not at the right computer to pull it out, but as the workshop manuals are readily accessible I'm running on the presumption you have them. Otherwise PM @Mr Googler for his forum copies on onedrive
alt
Well-Known Member
Thanks Bruce, yeah I have them, but searched them and couldn't get a figure. Someone on a FB forum stated 40Nm which rings a bell!
petem
Well-Known Member
If Mr Googler doesn't respond I can send you the manuals in the morning, however I have had a quick look and can't see those particular torque settings).
BruceK
Well-Known Member
Page 6
Tightening torques
Tightening torques for vital joints that must be tightened
with a torque wrench are listed in workshop
manual “Technical Data”: “Tightening Torques” and
are contained in work descriptions in this Manual. All
torques apply for cleaned threads, screw heads and
mating surfaces. Torques apply for lightly oiled or dry
threads. If lubricants, locking fluid or sealing compound
are required for a screwed joint this information
will be contained in the work description and in “Tightening
Torques” Where no tightening torque is stated
for a joint use the general tightening torques according
to the tables below. The tightening torques stated
are a guide and the joint does not have to be tightened
using a torque wrench.
Dimension Tightening Torques
.............Nm...........lbt.ft
M5............ 6 .............. 4.4
M6........... 10 ............ 7.4
M8 ...........25............. 18.4
M10........ 50.............. 36.9
M12....... 80.............. 59.0
M14 ......140.............103.3
deviations are:
Tightening torque
Cylinder head screws ........................................................... See next page
Main bearing screws (early model)
31 series (up to engine number 2203118631)
41 series (up to engine number 2204144595)
42 series (up to engine number 2204203834) .................. 80 Nm (59.0 lbf-ft) + 60° in one movement
Main bearing screws (late model)
31 series (as from engine number 2203118632)
41 series (as from engine number 2204144596)
42 series (as from engine number 2204203835)
32/43/44/300 series ........................................................... 60 Nm (44.2 lbf-ft) +90° in one movement
Con rod nuts ......................................................................... 113 Nm (83.3 lbf-ft)
Flange, front camshaft bearing ............................................ 24 Nm (17.7 lbf-ft)
Gear wheel, camshaft .......................................................... 85 Nm (62.6 lbf-ft)
Gear wheel, pump drive ....................................................... 24 Nm (17.7 lbf-ft)
Shaft stub for idler wheel, gear train .................................... 24 Nm (17.7 lbf-ft)
Pump housing, lube oil pump ............................................... 24 Nm (17.7 lbf-ft)
Bracket, lube oil pump ......................................................... 24 Nm (17.7 lbf-ft)
Idler wheel, lube oil pump..................................................... 24 Nm (17.7 lbf-ft)
Bearing cap, rocker arm shaft
31/32/41/42/43 series ........................................................ 48 Nm (35.4 lbf-ft)
44/300 series ..................................................................... 24 Nm (17.7 lbf-ft)
Sump .................................................................................... 15 Nm (11.0 lbf-ft)
Drain plug, sump (where appropriate) .................................. 60 Nm (44.2 lbf-ft)
Timing cover ......................................................................... 24 Nm (17.7 lbf-ft)
Valve housing (31/32/41/42/43 series: upper) ..................... 8 Nm (5.9 lbf-ft)
Inspection hatch for valve lifter ........................................... 24 Nm (17.7 lbf-ft)
Hollow screw for adapter / oil filter ....................................... 50 Nm (36.8 lbf-ft)
Hose connection for oil filter ................................................ 50 Nm (36.8 lbf-ft)
Nipple for hose connection to oil filter ................................. 60 Nm (44.2 lbf-ft)
Flywheel ................................................................................ 65 Nm (47.9 lbf-ft) + 60° in one movement
Bell housing .......................................................................... 48 Nm (35.4 lbf-ft)
Vibration damper, fixing screws ........................................... 28 Nm (20.6 lbf-ft)
center screw for hub.......................................................... 180 Nm (132.7 lbf-ft)
Injection pump, delivery valve holder .................................. 40 Nm (29.5 lbf-ft)
Nut, injection pump flange ................................................... 90 Nm (66.3 lbf-ft)
Injectors, nut for stud ........................................................... 24 Nm (17.7 lbf-ft)
Turbocharger, exhaust pipe flange ...................................... 45 Nm (33.1 lbf-ft)
Cylinder head screws
Tighten screws in 5 stages as per schedule:
1:st tightening 30 Nm (22.1 lbf-ft)
2:st tightening 60 Nm (44.2 lbf-ft)
3:rd tightening 100 Nm (73.7 lbf-ft)
4:th tightening 90° in one movement
Final tightening 90° in one movement
Tightening torques
Tightening torques for vital joints that must be tightened
with a torque wrench are listed in workshop
manual “Technical Data”: “Tightening Torques” and
are contained in work descriptions in this Manual. All
torques apply for cleaned threads, screw heads and
mating surfaces. Torques apply for lightly oiled or dry
threads. If lubricants, locking fluid or sealing compound
are required for a screwed joint this information
will be contained in the work description and in “Tightening
Torques” Where no tightening torque is stated
for a joint use the general tightening torques according
to the tables below. The tightening torques stated
are a guide and the joint does not have to be tightened
using a torque wrench.
Dimension Tightening Torques
.............Nm...........lbt.ft
M5............ 6 .............. 4.4
M6........... 10 ............ 7.4
M8 ...........25............. 18.4
M10........ 50.............. 36.9
M12....... 80.............. 59.0
M14 ......140.............103.3
deviations are:
Tightening torque
Cylinder head screws ........................................................... See next page
Main bearing screws (early model)
31 series (up to engine number 2203118631)
41 series (up to engine number 2204144595)
42 series (up to engine number 2204203834) .................. 80 Nm (59.0 lbf-ft) + 60° in one movement
Main bearing screws (late model)
31 series (as from engine number 2203118632)
41 series (as from engine number 2204144596)
42 series (as from engine number 2204203835)
32/43/44/300 series ........................................................... 60 Nm (44.2 lbf-ft) +90° in one movement
Con rod nuts ......................................................................... 113 Nm (83.3 lbf-ft)
Flange, front camshaft bearing ............................................ 24 Nm (17.7 lbf-ft)
Gear wheel, camshaft .......................................................... 85 Nm (62.6 lbf-ft)
Gear wheel, pump drive ....................................................... 24 Nm (17.7 lbf-ft)
Shaft stub for idler wheel, gear train .................................... 24 Nm (17.7 lbf-ft)
Pump housing, lube oil pump ............................................... 24 Nm (17.7 lbf-ft)
Bracket, lube oil pump ......................................................... 24 Nm (17.7 lbf-ft)
Idler wheel, lube oil pump..................................................... 24 Nm (17.7 lbf-ft)
Bearing cap, rocker arm shaft
31/32/41/42/43 series ........................................................ 48 Nm (35.4 lbf-ft)
44/300 series ..................................................................... 24 Nm (17.7 lbf-ft)
Sump .................................................................................... 15 Nm (11.0 lbf-ft)
Drain plug, sump (where appropriate) .................................. 60 Nm (44.2 lbf-ft)
Timing cover ......................................................................... 24 Nm (17.7 lbf-ft)
Valve housing (31/32/41/42/43 series: upper) ..................... 8 Nm (5.9 lbf-ft)
Inspection hatch for valve lifter ........................................... 24 Nm (17.7 lbf-ft)
Hollow screw for adapter / oil filter ....................................... 50 Nm (36.8 lbf-ft)
Hose connection for oil filter ................................................ 50 Nm (36.8 lbf-ft)
Nipple for hose connection to oil filter ................................. 60 Nm (44.2 lbf-ft)
Flywheel ................................................................................ 65 Nm (47.9 lbf-ft) + 60° in one movement
Bell housing .......................................................................... 48 Nm (35.4 lbf-ft)
Vibration damper, fixing screws ........................................... 28 Nm (20.6 lbf-ft)
center screw for hub.......................................................... 180 Nm (132.7 lbf-ft)
Injection pump, delivery valve holder .................................. 40 Nm (29.5 lbf-ft)
Nut, injection pump flange ................................................... 90 Nm (66.3 lbf-ft)
Injectors, nut for stud ........................................................... 24 Nm (17.7 lbf-ft)
Turbocharger, exhaust pipe flange ...................................... 45 Nm (33.1 lbf-ft)
Cylinder head screws
Tighten screws in 5 stages as per schedule:
1:st tightening 30 Nm (22.1 lbf-ft)
2:st tightening 60 Nm (44.2 lbf-ft)
3:rd tightening 100 Nm (73.7 lbf-ft)
4:th tightening 90° in one movement
Final tightening 90° in one movement
alt
Well-Known Member
Spotted that in my own manuals, no specific mention of the exhaust manifold studs / bolts!
BruceK
Well-Known Member
IIRC they are M10 so as per above 50Nm. The stud only goes in finger tight. You dont torque that down, it'd be counter productive, just the nut
alt
Well-Known Member
Bugger, I only tightened to 40Nm.
I wonder what I have to strip to get access to them all.
I'll measure the thread diameter tomorrow morning, I know the nuts are 15mm
I wonder what I have to strip to get access to them all.
I'll measure the thread diameter tomorrow morning, I know the nuts are 15mm
BruceK
Well-Known Member
9/16th ! Trust an imperial bolt to muddy the water. Treat it as a 10 if that is what it measures. Though to be perfectly frank those bolts are not critical and an approximation will do. I do mine up by feel. The standard length of a spanner is a good feel indicator of where the torque should be. I wouldn't go to town on it personally.
Mr Googler
Well-Known Member
alt
Well-Known Member
They're 9/16th? Was almost certain they were 15mm!
I ask because when I started the engine earlier, I saw 1 drop of coolant over 2 exhaust manifold gaskets. I wiped them clear and they didn't return, but when I inspected after, I spotted 1 drop of coolant on the side of the block.
I'm certain there wasn't any coolant there before. I didn't spill any coolant when filling (a few weeks back).
I also noticed that on one of the gaskets, on the exposed bit of it (looking down from the top of the engine), went rusty!
I tightened to 40Nm, but used an extension.
I think it may be safer to not do anything until I can run the engine and test again (and let the temp get up a bit) - I'm waiting on a new exhaust elbow / turbo clamp.... my current one is dodgy so needs to be replaced.
I ask because when I started the engine earlier, I saw 1 drop of coolant over 2 exhaust manifold gaskets. I wiped them clear and they didn't return, but when I inspected after, I spotted 1 drop of coolant on the side of the block.
I'm certain there wasn't any coolant there before. I didn't spill any coolant when filling (a few weeks back).
I also noticed that on one of the gaskets, on the exposed bit of it (looking down from the top of the engine), went rusty!
I tightened to 40Nm, but used an extension.
I think it may be safer to not do anything until I can run the engine and test again (and let the temp get up a bit) - I'm waiting on a new exhaust elbow / turbo clamp.... my current one is dodgy so needs to be replaced.
BruceK
Well-Known Member
Well, in as much as 15mm would be a unusual size. Certainly not standard.
Did you cross tighten them down? A leak is obviously not right.
alt
Well-Known Member
Started in the middle and worked my way out.
The drip was coming from either cylinder 2 or 3 (1 being at the stern, turbo side).
I'm tempted to take things apart tomorrow to check torque again but don't know what they should be at! Currently at 40nm... do I risk 50nm?
The drip was coming from either cylinder 2 or 3 (1 being at the stern, turbo side).
I'm tempted to take things apart tomorrow to check torque again but don't know what they should be at! Currently at 40nm... do I risk 50nm?
tico
Well-Known Member
N. Seem to remember 50nm. Studs are 10mm (M10)
alt
Well-Known Member
Thanks. Going to tighten to 50nm and see if that helps. I can only get a torque wrench to about 8 of them without dismantling so ill see how much of a turn I get on the wrench and go with that for the spanner
alt
Well-Known Member
Tightened everything up to 50Nm and was able to run at idle, no leaks! I'll launch next week to run under decent load (boat hasn't been polished etc. yet) and hope for the best.
Fingers crossed I just didn't tighten enough.
Fingers crossed I just didn't tighten enough.
tico
Well-Known Member
Fingers crossed for you
