Chris's 172 Cup Turbo

[Bmac]

Just be mindful of the post cat sensor. Mine was fine, then this weekend I fitted a new exhaust which has made the cat sit higher, that and pulling the engine forward has pushed the post cat sensor into the heatshield and gear linkage which then blows the fuel pump fuse when it shorts. Now I need a new sensor!

 

[MrBlonde]

This worked for me also on my cup,losen engine mount and pull engine towards you and then tighten.I think its exhaust that knocks on the bulkhead.

 

[cjgower]

Thanks all. Have tried and tested yet, but, I did manage to move the engine forward a fair bit yesterday.

Also had a chance to photograph top mount setup. Does all look correct?

These are the top hats. The nut appears to spin on one of them but is fixed on the other. No idea if that’s correct.

I’m sure that it’s separate to the knock and hopefully the engine position is the culprit. Will try tomorrow when the weathers improved.

 

[Mr Underhill]

Looks all good to me. Obviously, I can't see all of it, but I assume this is how it's assembled.

 

[cjgower]

Looks all good to me. Obviously, I can't see all of it, but I assume this is how it's assembled.

View attachment 1693924

Yes from memory, this is exactly the setup/order. I didn’t realise there were two types of top mount until researching this past week.

Every 172 I’ve owned has already had the updated design without the spacer but. Cheers

 

[cjgower]

So, i've taken both shock absorbers out, and unassembled both. The passenger side spring looks like it had been compressed to the point that the bump stop had split in two. Should the spring be compressing to the point that the coils rub together? (pic below)

Measures taken so far to try and cure this issue:

- New top mount bearings
- New upper gearbox mount
- Polybushed dogbone
- Swapped to OEM dogbone
- Swapped back to Polybushed dogbone
- Triple-checked steering rack bolts are tight
- Moved engine forward and tightened down the engine mount

Knock is still there. I will be booking the car in to be looked at by a garage... although I am wondering if larger outter arb bushes would help? mine look almost loose. I ordered 23mm outter bushes for reference and the arb on the car when dismantling looked to be new/recently swapped.

 

[Brigsy]

Bumpstops always fall to bits on these, as they are used as secondary damping when lowered. I destroyed a bumpstop riding the kerbs at Blyton.

Id imagine the springs are progressively wound so will touch coils a bit.