head bolts

[trev15]

DONT KNOW WHAT TO SAY , they def all only turn a 1/8 to 1/4 turn untill clicking on torque at 98nm then i stop all done in manual order starting from center num 1 then in sequance, all tight felt the same cant wait get running up to temp see what happens.

[winterheating]

ford state on the diesel mk6 engines code name puma (since they dont have an actual name ) to measure the bolts to see if they can be used again.

never checked on the di though.

[winterheating]

DONT KNOW WHAT TO SAY , they def all only turn a 1/8 to 1/4 turn untill clicking on torque at 98nm then i stop all done in manual order starting from center num 1 then in sequance, all tight felt the same cant wait get running up to temp see what happens.

i think youll be ok, also i dont think giving each one an equal 1/8 more turn with a bar (or torque wrench turned right up) will do any harm either.

Does it not mention re checking/torquing after up to running temp on that engine??

[trev15]

manual on mk5 says use 3 times center punch bolts so people know how many times used [no marks on yet so could be second time 120.000 miles 1998 i have a look at re torque after temp i know you doafter running in engine buid.

[winterheating]

new one bought today tool station, set it 70nm then wait for clicks ,then set it to 98 nm thinking that would be 1/4 turn so all 98nm dont think over tight as a 1/4 turn is a long way i understand ive cock it up but going to put back to geather in morn fire up see if blue smoke gone if not got to take part do piston rings if all ok with smoke if head gasket goes have to do it again yrs a go we just crack them all up not fi car only old solid head never leak or got hot before so i let you know if you wont to trev.

MrMpuk is right, ie. you should not re-use stretch bolts because of fatigue possibility.

However they are only being re-used for the second time and not exactly stressed, certain manufacturers have stated that they can be re-used 3 times.

The main thing is to do what you have done and torque evenly in the correct sequence ignoring the 90 degree bit which is only necessary on new bolts.

98nm is a good figure to set them at as 90-110nm is common target.

Manufacturers only use stretch bolts to save money from hopefully eliminating re-torque during warranty, their factory machines whack them on between 45 and 180 degrees!

Old motors only run on good vibes anyway, i bet it will run brahma.

so if they beemn used and you should not angle tighten, does that mean you shouldnt need to retorque asfter getting up to temp either?

[whitemice]

new one bought today tool station, set it 70nm then wait for clicks ,then set it to 98 nm thinking that would be 1/4 turn so all 98nm dont think over tight as a 1/4 turn is a long way i understand ive cock it up but going to put back to geather in morn fire up see if blue smoke gone if not got to take part do piston rings if all ok with smoke if head gasket goes have to do it again yrs a go we just crack them all up not fi car only old solid head never leak or got hot before so i let you know if you wont to trev.

MrMpuk is right, ie. you should not re-use stretch bolts because of fatigue possibility.

However they are only being re-used for the second time and not exactly stressed, certain manufacturers have stated that they can be re-used 3 times.

The main thing is to do what you have done and torque evenly in the correct sequence ignoring the 90 degree bit which is only necessary on new bolts.

98nm is a good figure to set them at as 90-110nm is common target.

Manufacturers only use stretch bolts to save money from hopefully eliminating re-torque during warranty, their factory machines whack them on between 45 and 180 degrees!

Old motors only run on good vibes anyway, i bet it will run brahma.

so if they beemn used and you should not angle tighten, does that mean you shouldnt need to retorque asfter getting up to temp either?

They have been previously 'plasticised' so you are now looking for an actual unquoted torque figure and with 90-110nm you are in the right ballpark, as an owner/driver i would re-check/re-apply torque after a satisfactory trial run of the engine after 100 miles or so.

[trev15]

Hello, its all back togeather, bit of scare, the book says there is 5 m10 and thats right then it says 8 m8 but there is only 4 check and doulbe check for got to say rocker gear pedestals to cylinder head theres only 4 holes for small bolts am i right as driveing me mad? trev.

[Jim Archer]

If you are careful you might be able to rescue it.

Starting from the middle i.e. No1 bolt on diagram, carefully just (i.e. still nipped) loosen each bolt and then retorque to 75N/M each bolt in turn. Then - again from middle - give each 1 a full 1/4 turn, use the biggest breaker bar to hand if need be as it needs a good bit of effort.

Don't blame me if it goes tits up when a bolt breaks - as they're only really meant to be used the once as they take a set/stretch, or the gasket doesn't hold 'cos you've stretched the bolts too far.

If you want to be certain, swap the bolts out for new ones - replace as above - as doubt you've pulled the gasket down to full compression with just 98N/M.

Even better, new bolts and gasket.

Jim

[trev15]

Hi, can any body put my mind at rest how many bolts hold the rocker pederstal to cylinder head i make [9] 5 m10 and 4 m8 is this right please thanks trev