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Hi,
You have made me curious about these front wheel drive engines now?
Why can you not reuse the bolts that were in the engine?
There is probably a reason why Volvo doesn’t offer them, because of, no demand being one!
Wanting to sell more cars could be another one? But, if they were really that critical that would only work up to a point. Bolts are too available, so, Not so, IMO?
On the 240s you can reuse the head bolts, but only twice.
I wasn’t aware that the connecting rods bolts could ever be put under the stresses that the head bolts can get.
The bolts only hold the cap on that makes up a journal’s circle.
The actual thrust of the piston is transferred onto the upper end of that journals circle.
The cap only holds onto the rod and the piston assembly as a unit from being flung off the crankshafts journals.
If the mechanic is worried about those cap bolts, what does he think he is going to do about the crankshafts bolts? They have to hold the whole lower end together from the hammering from above!
I might be a little behind the times here but I wouldn’t worry about those cap bolts.
I would worry more about him not keeping the rod caps attached on to each rod as that the cap came off of the crankshaft.
And changing out those cap bolts could be a mistake! IMHO
You see, In today’s engines the rods could be made from sintered metal forgings or not?
A whole newer technology may have been used in there? I have no idea about the 850s but Ford was into that with their cars.
If these rods are like those mentioned above, the big ends of the rods are intentionally made to be completely machined first!
At First the bolt holes are drilled and tapped to remove material.
Then the cap is broken off from the rods big end!
When it’s broken away from the rod itself and the split line is a matched set to that connecting rod only!
The bolts are then installed and then the big bore is machined so they are a set!
On earlier engines the split line had to be machined separately and then assembled.
The rods are weighed and gathered as a group set for balance along with the pistons! Everything but the bearing inserts are there and heck, they might even be weighed from the manufacturers as a set, for all I know?
On the 240’s the upper “camshaft” has numbered caps in a sequence from front to rear when the cam journals are “line bored.”
I have never opened the bottom of a Red Block, but I can only imagine a similar thing is done down there!
It is one of “many reasons” why those engines are named as close to “bulletproof” as you can get because the Swedish know or knew their metals too!
With the 850’ and other later types of engines, Volvo started shaking many different hands!
In fact, all of their cars, like many other production cars, they shopped over many vendors!
Like the 240 they get a little bad, with a lot of good, if done wisely!
So with that, I would question, why not used everything in that engine the way it came apart!
I liked the idea, that the whole engine has done a lot of spinning.
So the ingredients are still there and proven to be in harmony!
It has gone many miles!
Don’t mess with success.
Sometimes, new parts don’t meld without some teething!
You only want to replace metal that has wore away and those bolts don’t wear in this case!
Just my opinion for what ever it’s worth?
Phil
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