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[Webby the Bear]

Thanks for your input guys.

One thing I'm confused about is how on a set up like the ford as cam and crank are both locked and cant move, how is the slack taken up on the non-tensioner side?

[Rods2]

Thanks for your input guys.

One thing I'm confused about is how on a set up like the ford as cam and crank are both locked and cant move, how is the slack taken up on the non-tensioner side?

I would assume that if the return tension is different to the feed side they would equalise once the crank and cam are unlocked so the timing is very slightly out.

[Webby the Bear]

ok, so am I over thinking this?

like with the ford belt I fit it as tight as I can up the non-tension side, over the cams and then set the tension,as long as they all line up after a few turns of the engine all is good correct?

[henryd]

Thanks for your input guys.

One thing I'm confused about is how on a set up like the ford as cam and crank are both locked and cant move, how is the slack taken up on the non-tensioner side?

Once the cams are locked with the bar both pulleys are slackened so they spin freely,new belt is fitted and tensioned correctly them can wheels retightened and timing is spot on

[Webby the Bear]

right, ok henry that makes sense!. so basically I can slacken them off and pull them round towards the tensioner so slack side is tight. and then tensioner tensions the, err, tension side? lol

[henryd]

right, ok henry that makes sense!. so basically I can slacken them off and pull them round towards the tensioner so slack side is tight. and then tensioner tensions the, err, tension side? lol

Yep,get it tensioned then tighten up sprockets and job should be a good un 

[Marks DTM Calib]

Sprockets are on a taper fitting.....this is actually something of a weakness on these and I have seen it cause trouble on a few occasions!......quite possibly due to some pros aversion to torque wrenches!

[Webby the Bear]

Ok, so basically in the two set ups I've shown pictures of.... the first one you can back the crank off to allow for the tensioner to pull the slack out of t'other side and the ford set up you loosen the sprockets so they free-wheel and move thus also pulling the slack out.

That all makes perfect sense.

Soooo.

is there any modern-ish set up where you don't take the slack out and you simply lock crank and cams, stick the belt on and you're done? or is there always one way or another of getting the slack side tight?

hope that makes sense lol

[Webby the Bear]

Hmmm, now a tad confused.

Just watched a 02 Honda civic sohc cambelts done on youtube.

Now I  was going to do one of these last week but woman never turned up grrrrrrrrr

Anyways as this engine also doesn't have a lock tool kit, he lined the cam marks up with the cylinder head and marked the belt. Fine. He then made sure the crank Mark was lined up and marked it with tippex too. Fine. He then fitted the belt. But he DEFINITELY didn't back the crank off cis when he pulled the tensioner spring up on to the pin on the block it didn't move (his camera was from below at that point so you could see crank and tensioner in one).

Yet he turned it over with no trouble and all marks lined up.

Why am I not getting this? Lol

[Marks DTM Calib]

As already said, the key is to get the non tensioner side of the belt tight, you can do this without knocking the crank back, its personal choice.

[Nick W]

Also, single cam engines don't move as much as twincams.
If you have a nice short timing chain like on OHV engines, they rarely move at all.

[Marks DTM Calib]

Also, single cam engines don't move as much as twincams.
If you have a nice short timing chain like on OHV engines, they rarely move at all.

Ha ha, dream on!

They stretch like no tomorrow unless you fit expensive ones (which manufacturers never did), Rover V8 is an absolute classic example of that one 

[Nick W]

Surely they don't stretch whilst you fit  them, which is what we're discussing here?

[Marks DTM Calib]

No, but then a belt doesn't either 

[Webby the Bear]

So, if knocking the crank back isn't necessary (although I suspect that'd be my preferred method) we must be talking a bit of gorilla brute force power to get the belt over the cam and to have the non-tension side tight?