Water leaking from manifold bolt hole....HELP!
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Water leaking from manifold bolt hole....HELP!
I'm replacing the stock exhausts on my 1991 Merc 454s. I've had to pull both motors as each outter manifold had badly corroded bolts, some of which i have had to drill the bolt heads off.
One manifold was really bad, i've had to use a lump hammer and chisels to get the thing to slide off what is left of the bolts. I managed to get it off but 3 bolts are corroded into the head. So i have started to drill them out, one of them is leaking water from the manifold bolt hole...could someone explain why this is and if i should be concerned??
Cheers
Steve
One manifold was really bad, i've had to use a lump hammer and chisels to get the thing to slide off what is left of the bolts. I managed to get it off but 3 bolts are corroded into the head. So i have started to drill them out, one of them is leaking water from the manifold bolt hole...could someone explain why this is and if i should be concerned??
Cheers
Steve
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If it is leaking now after you drilled it then you drilled too far into the water jacket of the head. or the jacket has cracked behind the bolt hole. I work in a ford dealer and we have had alot of problems with manifold studs. we have had a coupe people drill too far. we have offered 2 options.
1. replace the head
2. seal and thread a plug in behind the stud.
i think everyone has opted for option 2. unless it is a real wild setup you should be ok sealing the hole. just cross your fingers that there is no migrating crack or other damage to the head that may let you down later.
the perfect repair would be replacing the head. but that costs a little $
just my 2c
1. replace the head
2. seal and thread a plug in behind the stud.
i think everyone has opted for option 2. unless it is a real wild setup you should be ok sealing the hole. just cross your fingers that there is no migrating crack or other damage to the head that may let you down later.
the perfect repair would be replacing the head. but that costs a little $
just my 2c
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If it is leaking now after you drilled it then you drilled too far into the water jacket of the head. or the jacket has cracked behind the bolt hole. I work in a ford dealer and we have had alot of problems with manifold studs. we have had a coupe people drill too far. we have offered 2 options.
1. replace the head
2. seal and thread a plug in behind the stud.
i think everyone has opted for option 2. unless it is a real wild setup you should be ok sealing the hole. just cross your fingers that there is no migrating crack or other damage to the head that may let you down later.
the perfect repair would be replacing the head. but that costs a little $
just my 2c
1. replace the head
2. seal and thread a plug in behind the stud.
i think everyone has opted for option 2. unless it is a real wild setup you should be ok sealing the hole. just cross your fingers that there is no migrating crack or other damage to the head that may let you down later.
the perfect repair would be replacing the head. but that costs a little $
just my 2c
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