joining/sealing exhaust system

[guest2982]

I had to replace exhaust and decided to do cat as well as it seemed rusty.
system has two conical gaskets one from manifold to cat, and the other one midsection to back-box.
system I've got was shipped with two wire gaskets(original for manifold/cat was graphite)

tightened up both connections and was riding for few weeks to allow them to set
but they still seem to be blowing, especially rear one.

should I have used some exhaust paste, if so where?
 does anyone know if stock rear one is mesh or graphite?

thanks -d

[guest5589]

I recently got my backbox replaced. Kwikfit used such a gasket between the centre pipe and backbox.
http://www.ebay.co.uk/itm/HONDA-CR-V-Jazz-Exhaust-Flange-Conical-Gasket-/280776833426?hash=item415f9a7992:g:UzwAAOxydINSYANz

its another thing that the exhaust is hitting the underside of the floor over bumps :S

looking at the parts on Lings website, you can see the 11 and 14 are the two gaskets that you must have gotten and they do look different..
http://www.lingshondaparts.com/honda_car_parts_selection_pfk.php?block_01=17SAA01&block_02=B__0200&block_03=20077

[guest2982]

yeah, just ordered graphite one for the front.
rear one is wire mesh as referenced,

I just realised that there was also a compression(?) ring/spacer 7cm ish in diameter, which I did not fit, that's what is probably wrong with rear joint, it probably has to go behind wire gasket so gasket is pushed further into joint, I will try that.

[guest5589]

yeah, just ordered graphite one for the front.
rear one is wire mesh as referenced,

I just realised that there was also a compression(?) ring/spacer 7cm ish in diameter, which I did not fit, that's what is probably wrong with rear joint, it probably has to go behind wire gasket so gasket is pushed further into joint, I will try that.

can you post a photo of that compression washer? I don't think that was present when my backbox was put on but it doesn't leak as far as i can tell.. why the exhaust is hitting the underside I cannot understand..

the new backbox was a bit flatter than the old one. .and I feel its pulling the centre pipe closer to the centre of the car.. hmm..

[guest2982]

yeah, I'll try to do that

well aftermarket exhausts are not exact fit unfortunately
maybe worth checking if all rubber mounts are in place/secured and shaking by hand from underneath to see where the excessive movement is.

my previous, stainless steel one, had to be bent a bit to fit, at least that what I was told
current cheap one has midsection which is adjustable in length for better fit

[guest1372]

its another thing that the exhaust is hitting the underside of the floor over bumps :S

Yes! on left hand bumpy turns, need slightly longer rubbers or get under it and bend the exhaust hanger to drop it a bit.

I just realised that there was also a compression(?) ring/spacer 7cm ish in diameter, which I did not fit, that's what is probably wrong with rear joint, it probably has to go behind wire gasket so gasket is pushed further into joint, I will try that.

This Euroflow mid pipe has a welded on spacer as part of the joint with the back box, I guess that without that a much larger metal fibre donut would be needed. I would not use any paste with a conical fibre washer, the only place would be the flat cat to mid pipe joint, but there was a flat gasket available at my factors for that although I ended up using paste.


--
TG

[guest5589]

its another thing that the exhaust is hitting the underside of the floor over bumps :S

Yes! on left hand bumpy turns, need slightly longer rubbers or get under it and bend the exhaust hanger to drop it a bit.

I just realised that there was also a compression(?) ring/spacer 7cm ish in diameter, which I did not fit, that's what is probably wrong with rear joint, it probably has to go behind wire gasket so gasket is pushed further into joint, I will try that.

This Euroflow mid pipe has a welded on spacer as part of the joint with the back box, I guess that without that a much larger metal fibre donut would be needed. I would not use any paste with a conical fibre washer, the only place would be the flat cat to mid pipe joint, but there was a flat gasket available at my factors for that although I ended up using paste.

--
TG

I will get under the car tomorrow and see whats going on. Considering the backbox was put on only a month ago, I really hope the spring bolts have not become welded on. But yeah my back box was put us using a similar looking mesh gasket and no paste

[guest5589]

This is what happened to me actually. Ignore the rust as that is what I have been doing..

Backbox fell off


Got a new shiny one from EuroCarParts (Klarius)..


Where the centre pipe bends towards the centre of the car, thats where the pipe is hitting. Maybe the box is pulling the pipe too much

[guest1372]

This is what happened to me actually. Ignore the rust as that is what I have been doing..

Backbox fell off

Oh snap, in both senses. I think you just need to bend the hanger arms, although easier said than done.
Mine broke after a prolonged period at 70mph; not a great design that lets it fall off - should have an extra hanger.

Th underside of your car looks in similar condition to mine, and re: wheel bearings my 2010 £150 Honda part and 2011 £35 patern part are both still 100%, although the Honda part seems more watertight.
--
TG

[guest5589]

This is what happened to me actually. Ignore the rust as that is what I have been doing..

Backbox fell off

Oh snap, in both senses. I think you just need to bend the hanger arms, although easier said than done.
Mine broke after a prolonged period at 70mph; not a great design that lets it fall off - should have an extra hanger.

Th underside of your car looks in similar condition to mine, and re: wheel bearings my 2010 £150 Honda part and 2011 £35 patern part are both still 100%, although the Honda part seems more watertight.
--
TG

Surprisingly weather seems to be ok today so I am going to get under the car and see what can be done.

But I am actually glad to hear about your wheel bearings.. I bought a pattern part a couple of days ago and plan to install it today.. Right now I am in investigative mode. If the pattern does resolve the whine than that will be result. Already spent money on two rear tyres thinking the were the reason but they werent!

[guest2982]

This Euroflow mid pipe has a welded on spacer as part of the joint with the back box, I guess that without that a much larger metal fibre donut would be needed. I would not use any paste with a conical fibre washer, the only place would be the flat cat to mid pipe joint, but there was a flat gasket available at my factors for that although I ended up using paste.

Thanks for confirmation!

I'll get back to this a bit later, nearly lost wheel on a longish journey.. got to sort this first.

[guest5589]

This Euroflow mid pipe has a welded on spacer as part of the joint with the back box, I guess that without that a much larger metal fibre donut would be needed. I would not use any paste with a conical fibre washer, the only place would be the flat cat to mid pipe joint, but there was a flat gasket available at my factors for that although I ended up using paste.

Thanks for confirmation!

I'll get back to this a bit later, nearly lost wheel on a longish journey.. got to sort this first.

dear lord.. what happened ?

[guest2982]

It developed knocking/vibrations which got worse at the end and when got back home wheel was going sideways..
I had intermittent knocking like this before, went to three different garages, they could not find a thing, problem came(knocking loudly), then after some time gone for months to come back later. So this time I thoughts it's same problem again, not paying due attention, preparing myself to replace driveshaft, nearly paid for my silliness dearly.

I did replace drop link and top rubber bush above the strut recently, removing strut assembly in the process, and after tightening up strut-to-hub bolts I applied antirust grease to nuts and visible thread.. so my current theory is that it penetrated deeper and nuts worked loose and bolt must have fallen off. haven't verified that yet..

[guest5589]

It developed knocking/vibrations which got worse at the end and when got back home wheel was going sideways..
I had intermittent knocking like this before, went to three different garages, they could not find a thing, problem came(knocking loudly), then after some time gone for months to come back later. So this time I thoughts it's same problem again, not paying due attention, preparing myself to replace driveshaft, nearly paid for my silliness dearly.

I did replace drop link and top rubber bush above the strut recently, removing strut assembly in the process, and after tightening up strut-to-hub bolts I applied antirust grease to nuts and visible thread.. so my current theory is that it penetrated deeper and nuts worked loose and bolt must have fallen off. haven't verified that yet..

That sounds scary but yeah sounds like something came loose..
I hate to admit, but before reading this I was planning to swap the rear hub myself to cure the bearing humm but now I am scared that I might not tighten it properly and will end up having the wheel overtake me on the motorway...

[guest2982]

That sounds scary but yeah sounds like something came loose..
I hate to admit, but before reading this I was planning to swap the rear hub myself to cure the bearing humm but now I am scared that I might not tighten it properly and will end up having the wheel overtake me on the motorway...

got torque wrenches to avoid guess work on that front
in case of rear hub, its one big nut with safety collar to bend, should be safe ish