V8 engine probs

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Idris - 29 Oct 2006 09:36 GMT

3.5 v8 in a 110 developed a knock yesterday, suspect its serious. Is it big
ends or little ends that tend to go on these?

Whats the way to go? Rebuild or look for a complete engine, if the latter
should I stick with carbs or look for a 3.9 efi engine. I want to stay with
LPG.

(Previous post on LPG questions)

Gerald

Reply to this Message

Badger - 29 Oct 2006 12:28 GMT

> 3.5 v8 in a 110 developed a knock yesterday, suspect its serious. Is it big
> ends or little ends that tend to go on these?

Little-end failure is very rare, big-end and main bearing wear is highly
probable but for the wear to be severe enough to actually become audible on
a rover v8 engine most likely leans the crankshaft will definitely need
reground. Is it a deep knock around idle or a sharp loud rattle as the
engine revs up? Is it a light constant rattle like tappets?

> Whats the way to go? Rebuild or look for a complete engine, if the latter
> should I stick with carbs or look for a 3.9 efi engine. I want to stay with
> LPG.

Easy to fit a 3.9, just change the needles in the carbs to ensure correct
fuelling. Note, this needs SU carbs, not strombergs, as there aren't
suitable needle profiles available for the 3.9's fuelling requirements with
strombergs.
Whereabouts are you?
Badger.

Reply to this Message

idris - 29 Oct 2006 22:02 GMT

> > 3.5 v8 in a 110 developed a knock yesterday, suspect its serious. Is it
> big
[quoted text clipped - 18 lines]
> Whereabouts are you?
> Badger.

It was fine when I drove it on Tuesday not even the slightest noise.
Next time started yesterday morning deep knocking noise. Dont think its
a tappet. Did compression test today on a cold engine as I didnt want
to run the engine to get it warm and all figures were I thought ok,
130 - 140.
I'm in Northants.
Gerald

Reply to this Message

Austin Shackles - 29 Oct 2006 22:34 GMT

>> > 3.5 v8 in a 110 developed a knock yesterday, suspect its serious. Is it
>> big
[quoted text clipped - 24 lines]
>to run the engine to get it warm and all figures were I thought ok,
>130 - 140.

not common to have a big-end go suddenly from no noise to knocking like
that, mind. normally they go through a stage of knocking a bit once hot...

Signature

Austin Shackles. www.ddol-las.net my opinions are just that
Soon shall thy arm, unconquered steam! afar Drag the slow barge, or
drive the rapid car; Or on wide-waving wings expanded bear the
flying chariot through the field of air.- Erasmus Darwin (1731-1802)

Reply to this Message

Austin Shackles - 29 Oct 2006 22:35 GMT

mean to add check for silly stuff like pulleys loose on shafts - spent some
time speculating about a knock on an engine once before discovering the PAS
pump pulley was loose on its shaft.

Signature

Reply to this Message