Question for mechanics

[Gapples]

Time to knock the dust of that tool box in the garage GA

Aye to sell the dam things Rob, my missus keeps on reminding me of the space it's all taking up

Any takers for an interesting collection of tools

 

[Fast Farmer]

In my experience with cars I'd trust the original studs over any aftermarket ones, only use new ones if there from the manufacturer of the vehicle your using

 

[fiat 9090]

I am surprised at the second bloke blaming the first, unless you are nailed on certain you are right, as a techy you really have to be very careful what you say, it can easily come back & bite you on the arse.
No matter how long you work on at a job you can can still be tripped up by something simple.

Anyway my take on manifold bolts is it's largely down to what engine you are working on.
Obviously I did IH & CaseIH all my working life & on IH engines with stud & nut set up I can't remember an issue really, I've reused them plenty times without problems.
On the Cummins manifold in the 7100 & 7200 magnums though you wouldn't dare put the old bolts back in, the original one were bad enough for breaking as it was & a right pita to drill out !

Hopefully though your second guy will have sorted the job this time.

It's the same with any new Holland 7.6 ltr engine that is doing 200 hp plus ,you wouldn't dare use old bolts ,

 

[fiat 9090]

I think it's not fair to blame the mechanic ,because it's up to the owner to take some of the blame ,if the engine is fueled up excessively then it will cause extra heat ,

 

[agri knives]

I think it's not fair to blame the mechanic ,because it's up to the owner to take some of the blame ,if the engine is fueled up excessively then it will cause extra heat ,

In this case it is origionial power . No turning up.

 

[Netherfield]

Had the head skimmed on a Peugeot 504 many years ago and got a declared "expert" to refit it. A few weeks later the head blew again. This happened twice more, so (as I do) I phoned Peugeot and spoke to a technician.

The Technician said, as above, torqued bolts can stretch and lose their temper. They should either be replaced or, if you are really mean, you can measure them to check that they haven't stretched.

I shall continue to annoy the technicians who know by asking questions and have learnt not to rely on experts. BTW, an expert is someone who knows more and more about less and less until he finally knows absolutely everything there is to know about nothing at all.

504 diesels were known to blow head gaskets for fun though.

 

[Sharpy]

Aye to sell the dam things Rob, my missus keeps on reminding me of the space it's all taking up

Any takers for an interesting collection of tools

Surely heartbreaking to sell good tools?

 

[Mur Huwcun]

It's the same with any new Holland 7.6 ltr engine that is doing 200 hp plus ,you wouldn't dare use old bolts ,

Any one who has had to drill, extract, weld, build up etc NH manifold bolts would never consider re using them!! Deutz/Fendt ones on the other hand shear flush with the nut, quick sharp blow with punch and they always unwind with molegrips!!!

 

[TripleSix]

Depends what the old ones look like.

Unless it's a Cummins...
Then new ones needes

 

[Dry Rot]

504 diesels were known to blow head gaskets for fun though.

Certainly blew a few until I replaced the bolts. Peugeot's explanation that the bolts stretch and lose their temper seemed to make sense. I think basically metal fatigue.

 

[fiat 9090]

In this case it is origionial power . No turning up.

In this case it is origionial power . No turning up.

Any one who has had to drill, extract, weld, build up etc NH manifold bolts would never consider re using them!! Deutz/Fendt ones on the other hand shear flush with the nut, quick sharp blow with punch and they always unwind with molegrips!!!

They are not nice to extract even newones go with us after a few thousand hours ,

 

[Mur Huwcun]

They are not nice to extract even newones go with us after a few thousand hours ,

They should of changed them to stepped studs well over 20yrs ago!!! They would then fail at the weakest point usually behind the nut not 1.5mm into the cylinder head

 

[Gapples]

Surely heartbreaking to sell good tools?

Nah not really, don't get me wrong they've kept me employed most of my working career but that's over now so they are just filling up my garage !
I've held onto them for 10 years or so since I had to call it a day ( ill health ) so I've had time to move on.
It is weird remembering walking through the old workshop doors, just turned 16 & wondering what lay ahead but I'm retired now, just got to take care of my health the best I can so the tools can go.

 

[Farmer_Joe]

Certainly blew a few until I replaced the bolts. Peugeot's explanation that the bolts stretch and lose their temper seemed to make sense. I think basically metal fatigue.

ha ha, i one had a 405 engine with head gasket symptoms bolts were lose when i went to take head off (well not loose but clearly not to proper torque), i just torqued them all back down with proper sequence it was fine! was my own car and went on to be trouble free!!

 

[Bobthebuilder]

Surely heartbreaking to sell good tools?

Worse seeing them sitting there not being used, I've know G many years and I bet it would be a bloody good set for a young lad starting out in the trade but not too many of them about

 

[Gapples]

Worse seeing them sitting there not being used, I've know G many years and I bet it would be a bloody good set for a young lad starting out in the trade but not too many of them about

Thanks Rob
It's a hell of a lot of tools I suppose, not the latest shinny snap on mind lol, I didn't go in for much of that stuff, but then it would be a fraction of the price if a young lad was interested !

 

[pail of ale]

No expert but normally replace exhaust manifold bolts and mostly with 8.8 grade generic bolts ,sometimes going longer and adding spacers ,especially with problematic manifold/bolt systems . For a mechanic ,it is very hard to know every make and model that will give trouble here . Did the manifold on an isuzu with an average of 33% of the stud and 50% of the spacer material rusted away on a hard working excavator and was not leaking at all . Others can start popping bolts the day after the warranty is up .