Calling All Engine Experts

[Peetypug 5]

I bought an engine off james28 with suspected bottom end gone

 

Im sure he will come on and tell you exactly what happened

 

It's history is it was jamietonks?? old 6 engine that had been fully rebuilt in the time he had it

 

It spat it's dipstick and oil out while he was at a track day and then got him the 110 miles home after, but sounded like it was running on 3 cylinders.

 

I've 90% stripped the bottom end and can find no damage at all, the head seems to be in perfect order as well

 

All the piston rings and bearings are fine and no sign of damage to anything. All the breathers are clear. No bits of metal in the oil etc!

 

Any ideas what could have caused it as I'm baffled :

[james28 0]

i really hope you find the answer i am so annoyed with it too

trust me ask oli pug yippeyiyaya or pugger and they will tell you how it was lol ruff as ten bears keep me posted mate

[24seven 104]

A loose spark plug can sound hideous a bit like a bottom end knock only you can't feel it through your feet (if part of the suspected failure was the shells anyway). If you're going to rebuild it anyway buy some plastigauge and check the clearances on the bearings. If as you say they're undamaged then they should be within tolerance (or at least not too far out taking wear into account).

 

As for the dipstick flying out clearly something pressurised the crank case enough to do it. Did you do a compression test before stripping it?

Edited April 22, 2011 by 24seven

[No Guts No Glory 1]

Given the info,

 

Sounds like a leak from one of the clyinders which inturn compressed the crank case pushing the oil out of the tube, This might of only happened once or for a very short time, hitting the rev limter (depending how the ecu does this) can course a large vacum or pressure in the cylinder which can upset piston ring seal, Sounding like it was ruinning on 3 clyinder could of been a plug fouled up in oil or the course to why the clyinder leaked in the first place.

 

I would defo cheak your pistons for cracks and cheak the clyinders are round, not oval!!!

[Peetypug 5]

The pistons are all fine, James told me the plugs were all fine and the compression test didn't throw anything suspicious into the light

All the piston rings seem fine as well

[Mikey S 29 1 Cars]

just to clarify: this engine was tappety, not running on all cylinders (perhaps 3 and a half?) and spat its oil everywhere. plugs were all in the head tight and a uniform colour which indicates no abnormal combustion has taken place.

 

pete, iirc the number two and three pistons were cracked, compression was down and jamie tonks was complaining of poor performance. have you checked the pistons for cracking and are all the rings ok? have you checked the ring gaps while they are in the bores and are they physically ok? the only thing this engine suffered was pinking when it got hot.

 

tis a strange one!

[james28 0]

this is Jamies post from when he owned the engine

 

Well bit of an update for anyone interested and I will get some pics up soon

 

I wanted the engine looked at because it felt sluggish low down to say the least. A compression test show 2 and 3 very low on pressure so unfortunatly its had to be rebuilt as i dont want it letting go whilst on the track. Stripping it down showed one of the rings split and on the other the piston has a small crack in it

 

This was a bit of a let down as its was only rebuilt less that a year ago. I wont mention any names

 

So its should be all back together Tuesday next week fully stripped rebuilt amd hopefully nice and fresh. Carl at CG cars if doing it all for me.

 

Ive almost got all the things I initialy want to do to the car prior to putting it all together now. The final things if anyone can help is the follwing

 

 

Jamie

 

This post has been edited by JamieTonks: 30 April 2010 - 07:20 PM

[Peetypug 5]

Pistons were fine in the block, nothing ovaled.

All the rings are fine. Pistons have no damage at all.

Other than the gouge in the head from the previously snapped valves there is no visible damage.

Will be taking the crank out tomorrow

 

Could it be a head problem?

[large 33]

Are the con rods ok. I managed to bend one about 7 years ago.

 

The engine had just had the head rebuilt and fitted by peugeot. All was ok at first drove fine but on opening it up under load (7k rpm in 6th) after that is sounded like someone had but a couple of spanners in one of the cylinders

 

So back to pug it went on investigation they found one of the con rods bent.

[dcc 855]

what lower pulley was there? was the engine timed up using the std 6 lower pulley? likely it had slipped a little making the engine slightly timed incorrectly.

 

the chances are that the coil was faulty, or breaking down under load.

[Alastairh 47]

what lower pulley was there? was the engine timed up using the std 6 lower pulley? likely it had slipped a little making the engine slightly timed incorrectly.

 

the chances are that the coil was faulty, or breaking down under load.

 

A coil breaking down causing it to throw oil out? Nah.

 

I was tempted to buy the engine also, but wasn't confident what the problem was. Because of the oil issue, i really would go back over the rings/pistons/block carefully. At the worst it will be the head.

 

Al

[dcc 855]

not to throw oil, but to run on 3, i think so. likely thing on an engine which is coming into a 10+ year old stage now.

[Peetypug 5]

All the rods are fine, so it's looking likely that your right dcc about the running issues.

I don't really want to strip the head, but may have to now

Edited April 24, 2011 by sorrentopete

[Mad Scientist 106]

I think I should bring my gauges etc and take a look at it mate. Pop down tomorrow?

[Peetypug 5]

Yea pete, that would be great.

Can't shift my ass off the sofa today, my head is mashed!

[Peetypug 5]

Problem identified

Oil pump pressure release piston had jammed in the pump, pump and piston are both badly scored and covered in like a sticky substance

Looks like the HG has gone at some point as the blades on the crank are a bit rusty

Edited April 25, 2011 by sorrentopete

[james28 0]

glad you got it sorted and have a sound engine