Big Ends

jimpearceuk · Post by **jimpearceuk** » Fri Sep 20, 2013 11:03 pm

Does anyone know what the symptom would be if you had a big end on the way out?

Thanks Jim

Post by **Simon Jones** » Fri Sep 20, 2013 11:17 pm

Do a search on Google for 'big end knock' and it returns lots of info (mainly for cars like Alfas) but the symptoms are all much the same. Good place to start is to do an oil and filter change and check for lots of metal particles. You may need to drop the sump and have a closer look. Never tried it myself, but I've got a spare in engine in the garage if you want to have look at what's involved.

hijimhere · Post by **hijimhere** » Sat Sep 21, 2013 1:12 am

What engine?

rita · Post by **rita** » Sat Sep 21, 2013 8:21 am

hijimhere wrote:What engine?

Diesel....

jimpearceuk · Post by **jimpearceuk** » Sat Sep 21, 2013 8:41 pm

yes sorry 2.5Tdi
I have a rattle, can't decide if it is Tappet or Big End

Thx Jim

jimpearceuk · Post by **jimpearceuk** » Sat Sep 21, 2013 8:42 pm

Simon Jones wrote:Do a search on Google for 'big end knock' and it returns lots of info (mainly for cars like Alfas) but the symptoms are all much the same. Good place to start is to do an oil and filter change and check for lots of metal particles. You may need to drop the sump and have a closer look. Never tried it myself, but I've got a spare in engine in the garage if you want to have look at what's involved.

Thanks Simon - let you know, not sure if it is a tappet or not

mikexgough · Post by **mikexgough** » Sat Sep 21, 2013 8:44 pm

You would know a big end from a tappet.... the big ends make a heck of a clatter as if the engine was going to explode.... ( in lay terms) plus you would have a huge loss of power...

francophile1947 · Post by **francophile1947** » Sat Sep 21, 2013 9:02 pm

mikexgough wrote: plus you would have a huge loss of power...

Why is that Mike?

Only time I've had big ends go didn't result in a loss of power, just a deep rumbling noise from the bottom of the engine and the oil pressure light coming on at tickover

This wasn't in a Bongo though.

Post by **Simon Jones** » Sat Sep 21, 2013 9:35 pm

Get yourself a mechanics stethoscope like this or use a length of dowel and use it to listen to various areas of the engine. It's very enlightening.

http://www.machinemart.co.uk/shop/produ ... tethoscope

hijimhere · Post by **hijimhere** » Sun Sep 22, 2013 12:40 am

Crankshaft bearings and big end bearings failure in any modern engine is not common. As far as noise goes it can vary from a rumble to a distinct knock ( note a malfunction of an injector can produce a similar but constant distinct knocks) which is usuall called piston slap). A small end problem can be similar to a tappet type noise.

The stethoscope will help you isolate which cylinder(s) are involved. These bearings are oil fed for obvious reasons and can lead to the oil warning light coming on. An assessment of oil pressure at idle then (if idle is ok) 2000rpm engine warmed might be worthwhile to judge if the engine is serviceable and not about to dump oil pressure. From then on it can get technical.

Beyond that it's drain oil from sump then bearings and crankshaft bearing and journals inspected! A visual inspection might source the problem however it is likely that you would need to begin measuring the journals to compare with the standard size from production.

I know the dealer over by Southam (Warks) will still go into an engine if needed but most these days will stick another second hand unit in for bearing problems.

jimpearceuk · Post by **jimpearceuk** » Sun Sep 22, 2013 4:31 pm

K thanks all - will let me mechanic know and see what he finds.

Still have this rough running on initial cold start to solve, having a few issues at the moment, at the fork int he road as to spend or sell ;(

Thanks again
Jim

teenmal · Post by **teenmal** » Sun Sep 22, 2013 5:03 pm

francophile1947 wrote:
mikexgough wrote: plus you would have a huge loss of power...
Why is that Mike? Only time I've had big ends go didn't result in a loss of power, just a deep rumbling noise from the bottom of the engine and the oil pressure light coming on at tickover This wasn't in a Bongo though.

Usually with any engine if the main or big end bearings are badly worn the vehicle will actually have more power owing to the fact that the engine is running FREE (less drag).

We have had a lot of peeps coming into the garage saying the engine is noisy but its going like the CLAPPERS.

hijimhere · Post by **hijimhere** » Sun Sep 22, 2013 10:25 pm

Does the roughness clear with a touch of throttle & I mean a touch? You are allowing the glow plug light on the dash to go out before you turn her over?

jimpearceuk · Post by **jimpearceuk** » Mon Sep 23, 2013 1:37 am

It does seem to go with a touch of the throttle yes, it also seems to get better when warmed up totally. I do wait for the glow light to go out and she starts lovely, just runs rough like it is going to cut for the first 30 sec to a min - then ticks over perfectly.
Then the clicking (sounds like a tappet noise to me) gets quieter once up to normal temp, but always there in the background,
My mechanic is going to change the glow plugs this week and see if that cured rough starting, as for rattle, at the keep it get rid stage at the moment.
Thanks Jim

teenmal · Post by **teenmal** » Mon Sep 23, 2013 9:53 am

Hi jimpearceuk, what readings (cold and hot) did the mechanic get when they checked the oil pressure.

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