What's the hardest repair you've ever done (by yourself)?

What's the hardest repair you've ever done (by yourself)?

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Acuity30

Original Poster:

697 posts

33 months

Wednesday 1st January
quotequote all
I try to do my own servicing and repairs where possible. I've never done something as involved as a headgasket though.
Hardest job I did by myself (with help from Haynes and Youtube) was the valve clearances on a Suzuki Intruder 800. I had previously done them on easier bikes so I knew what was involved, but the Intruder design left a lot to be desired. I had to fabricate a couple of tools in order to hold the valve adjuster in place while doing up the locknut because the frame just didn't allow access for any hands/fingers.
All in all not particularly 'hard', but you had to know what you were doing and make sure the engine is in the correct position. Plus a couple hours of removing stuff, making sure it's torqued back correctly, double and triple checking the measurements. I think it took me about 6 hours with regular breaks and cleaning every component on reassembly. Luckily it wasn't one of those jobs where you get stuck and have to wait a day or more for extra parts or tools to arrive.

Super Sonic

9,577 posts

69 months

Wednesday 1st January
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Clutch replacement, although I did need help to remove and replace the gearbox as it was heavy.
Also Cambelt. Spent an hour or more trying to remove the top nut from the rh engine mount, then realised it was welded in and it was the bolt had to be removed from below!
Civic mk 4.

Wacky Racer

39,756 posts

262 months

Wednesday 1st January
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Fitted a new camchain and sprockets to my Honda 90 Sports when I was sixteen.

Fitting a new cylinder head to my Triumph Bonneville when I was eighteen.

loughran

3,051 posts

151 months

Wednesday 1st January
quotequote all
Tentatively stripping and rebuilding these on a number of occasions, trying to find the gremlins and getting a bit better at it each time.

Eventually summing up the courage to drill the lead plugs and finally getting to the root of the problem. I'm no mechanic but I love working on carbs.



Weber 40 IDS

lufbramatt

5,488 posts

149 months

Wednesday 1st January
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Sump gasket on a bmw e39 5 series. Have to support the engine from above and drop the front subframe, steering column joint is a massive pain as no space to get tools in down the side of the exhaust manifold/cats.

About a hundred bolts to undo, have to take dipstick tube out and wiggle the sump around the oil pickup whilst the subframe is in the way of where you need to be. Horrible horrible job, and I’ve done suspension, exhausts, fuel pumps, interiors etc.

Easternlight

3,636 posts

159 months

Wednesday 1st January
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Timing chain on a petrol E46 BMW. N42
At home with no lift and made all the timing tools myself.

Pica-Pica

15,206 posts

99 months

Wednesday 1st January
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Back in the 1970’s. A clutch replacement on an Escort 1100. Lying on my back under the car, on stands, with the transmission on my knees. Never again (but I was younger then, and keener, and poorer). That was the only car I ever needed a clutch changed, even though later cars had done more mileage.

LuS1fer

42,540 posts

260 months

Thursday 2nd January
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1978 Mini rear subframe. Rubber cone suspension. It was a nightmare I could probably do better, now, in retrospect but there was no internet back then.

Ambleton

7,065 posts

207 months

Thursday 2nd January
quotequote all
I've done all sorts.

Rebuilt engines
Built a car from (almost) scratch
Currently Restoring another car (from bare rust bucket shell)

By far the most troublesome thing I've done was a front wheel bearing on a 2cv.

There's a lock ring which is M76x2 pitch. It has two little slots to undo it. It's torqued to 400Nm, then peened in two places.

The bearings are pretty robust and the ones I've done have never been done before. So they've been corroded together and painted several times over, which makes removal even more interesting. It's a fking awful job.

tdm34

7,445 posts

225 months

Thursday 2nd January
quotequote all
End Thread, Honda CBX1000 Carbs, over 400 individual parts, blocked pilot jets which are pressed in not screwed in, fuel passageway O-rings that turn to dust, Fabulous instruments when in good condition, but leave ethanol based fuel in them for a month or two you'll be cursing, I've only ever done two sets
both for other people, never again, I've done plenty of the DOHC Honda fours from that era and they're the same carb but they're in a straight bank
whereas the CBX carbs are in a shallow vee.

This is why the USA's foremost Carb restorer for the DOHC Honda's has an 3 month waiting time on his services, and the cost can be well over $1400

But his work is amazing

https://www.oldschoolcarbs.com/the-carburetors/cbx...


E-bmw

11,056 posts

167 months

Thursday 2nd January
quotequote all
On a car (you don't specify this) it would be an engine/cambelt/clutch/flywheel swap on a V40 1.6D2 at the start of last year.

Not on a car it would be a Training Gearbox swap on a GWS 25 910 Tracker pedestal. (although I did have a small amount of assistance with this)

Tony1963

5,685 posts

177 months

Thursday 2nd January
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Replacement of the quadruplex actuator on a Tornado taileron powered flying control unit.

But perhaps that doesn’t count for this thread wink

Dynion Araf Uchaf

4,873 posts

238 months

Thursday 2nd January
quotequote all
technically the hardest job I've done is strip and rebuild an engine, which included removal and refitting twice! Made some calamitous errors initially but got there in the end.

However the worst job on the same car is changing the clutch, should be 2-3 hours but my record is 8.

JimM169

691 posts

137 months

Thursday 2nd January
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Did the timing belt/water pump on my Peugeot 1.6 hdi last month. First time I'd ever attempted something like this - it wasn't really a difficult job but the pressure of knowing what could happen if I cocked it up was a bit nail biting.


Edited by JimM169 on Thursday 2nd January 15:35

Henry Cat

2,570 posts

38 months

Thursday 2nd January
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Trying to get the 20p coins out of the gap between the seat and the transmission tunnel .

ffc

708 posts

174 months

Thursday 2nd January
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An aircon refresh on a 964/911. Replacing the evaporator, condenser, dryer, expansion valve etc. Not particularly hard it just takes ages getting everything out and then back in again.

Alex Z

1,783 posts

91 months

Thursday 2nd January
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Swapped a barrel, piston and cylinder head on my SRX400 with help from a friend. It ran fine afterwards, too!

Super Sonic

9,577 posts

69 months

Thursday 2nd January
quotequote all
Henry Cat said:
Trying to get the 20p coins out of the gap between the seat and the transmission tunnel .
Aka the 'bermuda triangle'!

Tye Green

899 posts

124 months

Thursday 2nd January
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building a Megasquirt ecu, making and fitting the harness, then mapping a YB Cosworth in a kit car.

InitialDave

13,239 posts

134 months

Thursday 2nd January
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I think for sheer buggeration factor, replacing an E30 gear shift linkage without removing the exhaust or propshaft, and replacing the alternator on an AC-equipped Fiat Panda were some of the most disproportionately awkward jobs I've done for how technically simple they were.

Big stuff such as engine replacement etc isn't actually all that bad. It's the fiddly in-situ repairs with terrible access that ruin your day.