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Peugeot BE4 gearbox went bang. Why?

Peugeot BE4 gearbox went bang. Why?

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Discussion

Sensibleboy

Original Poster:

613 posts

47 months

Friday 4th August
quotequote all
I had my BE4 gearbox fitted with a shorter final drive about 300 miles ago and all was well until it suddenly went bang.

Was doing about 35mph in 3rd with very slight throttle applied at there was a massive bang and the car stood on its nose briefly.

The box had been behaving perfectly up until this point. No noises, gear change was perfectly smooth too.

It's not been stripped down thoroughly yet to see which gears have broken but there's definitely a load of gear teeth been broken off.

So does anybody know what can cause this to happen? It's like it's tried to select two gears at the same time.

Edited by Sensibleboy on Saturday 16th September 20:15

GreenV8S

24,721 posts

206 months

Friday 4th August
quotequote all
Sensibleboy said:
So does anybody know what can cause this to happen?
Pointless to speculate until it's been stripped down.

Old Merc

1,871 posts

89 months

Saturday 5th August
quotequote all
Favorite on these Pug boxes is the diff gears.Excessive wear in diff housing, sun & planet gears out of line and break up,bang! car stops.Everyone I`ve seen there is a hole in the diff housing part of the box.

Sensibleboy

Original Poster:

613 posts

47 months

Saturday 5th August
quotequote all
Crown wheel and pinion are fine in this one.

Old Merc

1,871 posts

89 months

Saturday 5th August
quotequote all
I would be having a strong word with who ever built this box ?
I bet all those "bits" are whats left of the diff gears. They are A B C D in this image.
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stevieturbo

12,639 posts

169 months

Saturday 5th August
quotequote all
Sensibleboy said:
So does anybody know what can cause this to happen? It's like it's tried to select two gears at the same time.
That would be one to ask whoever took it apart to swap the diff and exactly what they done at that time

Sensibleboy

Original Poster:

613 posts

47 months

Saturday 16th September
quotequote all
Gearbox is now dismantled. Every single 3rd gear tooth is completely stripped. The mechanic who built it originally and stripped it down this week just said he didn't know what had caused it. No suggestions were offered...

I'm trying to work out why it happened. The gear lever wouldn't engage any gear and when the car was pushed it kept catching on something. I don't know if one of the selector forks has come off the selector shaft or something. No information was being volunteered at all. All of the other parts including forks look fine.




stevieturbo

12,639 posts

169 months

Saturday 16th September
quotequote all
If something didnt get into the teeth to cause it, then it could just be a case of st happens. It is french after all.

But if all bearings are good, shafts are good, then there shouldbnt be a cause on that level.

227bhp

5,454 posts

50 months

Saturday 16th September
quotequote all
You weren't being very sensible with that were you boy? tongue out

lucido grigio

30,577 posts

85 months

Sunday 17th September
quotequote all
Definitely forked that is.

Thank me later.

Mr2Mike

17,648 posts

177 months

Monday 18th September
quotequote all
I predict it definitely won't be something left floating around the box when the shorter final drive was put in. At least that's why the guy fitting the final driver will say...