Thread: Why do 2.7 cranks break?

Originally Posted by econti

Remember however that V8s have 2 rods on the same plane of the crank (i.e. cyls 1 and 2 have big end bearings that sit next to each other), which is more force, compared to v6 which only has one.

Between main 2 and 3 you have two big ends and guess where it always breaks?

Originally Posted by haydent

I noticed there are "Upgraded" cranks available now as a preventative upgrade, cant be thicker but claim to be stronger i guess

RANGE ROVER LAND ROVER 3.0 TDV6 FORGED CRANKSHAFT + MAIN & BIG END BEARINGS SET | eBay

Dont believe what you read - completely discredited on the UK forums.

Originally Posted by DiscoJeffster

Between main 2 and 3 you have two big ends and guess where it always breaks?

Yeah but because it’s either of those bearings that pack it in first and nip up on the crank.

Originally Posted by haydent

Also for anyone wondering, here is TDV6 vs TDV8 crank for comparison, much thicker !

DISCO3.CO.UK - View topic - Range Rover 3.6 TDV8 - anyone got a head gasket?

Attachment 175021

This highlights well how the even firing V6 is inherently the weakest of the crank designs. And whilst the 60deg V6 is the better balanced option, it is still more prone to harmonic issues when compared to an inline 6.

Notwithstanding these inherent weaknesses, I am sure there are contributing factors that increase the risk of failure which can be largely mitigated as there are plenty of high mileage D3’s still running.

Originally Posted by DiscoDB

Do you know what KM’s Outback’s Discovery was at?

I would be gutted to have had asked the question and been assured the oil pump had been replaced and upgraded only to find out this was a lie.

210,000km in an 05

I've recently started to look into Tdv6 tuning...what a headache.

Anyways.. one of the torque limiters is active based on oil temperature, over 110° torque is reduced by greater and greater amounts.

I don't know if this due to reduced lubricity or as a requirement to stop the oil breaking down, either way I thought I'd mention it.

Cheers
James

Another good one in Russian. Activate subtitles.

Good bit starts at 9:00.

More references to oil cooler and oil pump

Bunch of stuff on hydraulic lifters and cam chain.

You’d think with our warm weather the issue of cranking time and lubricity would be non issues considering these frozen zones they operate in.

?????????? ???? ?????? ?????? ??????????? ????????? LAND ROVER! ??????? ?????? 2.7/3.0 ??????! - YouTube

Extended cranking time theory-

5 out of 6 of Fabians glow plugs in failed engine did not work. You don’t get a diagnostic warning but can check current draw.

Critical to starting fast in cold climates. As important as a healthy oil pump.

LR glow plugs glow the best by far compared to aftermarket in a test.

How to check glow plugs - glow plug compare - Land Rover Discovery 3/4 - TDV6 - YouTube