 | Home > Maintenance & Modifications > 2008 Puma 110 DCPU Front diff failure. |
 
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| BenB8man Member Since: 22 Mar 2017 Location: Norfolk Posts: 431   
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Anyone manage to catch this before it occurs in such spectacular fashion? Are you able to see this elongation from the oil drain/filler with an inspection camera?
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31st Oct 2020 11:58am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17603
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You probably could check for elongation through the filler hole.
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31st Oct 2020 12:32pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3480  
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Is this the result of too much wheelspin? Or poor quality?
I expect for 4 gear diffs, the pin cannot rotate in the housing. All rotation is between spider gear and pin. Perhaps for the 2 gear diff, would be smart to glue the pin to the housing and any wear will be in the spider gears or the pin itself. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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31st Oct 2020 5:07pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17603
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On a two-gear diff the pin cannot rotate until the locating roll-pin breaks, which invariable happens. The root cause is the Puma engine is too powerful for the single cross-pin to sustain - bear in mind that the entire front driveline power is transmitted through that single pin, and the contact areas between the pin and the diff cage is relatively small. Bottom line, the diff was not designed for an engine with some much torque in a farily heavy vehicle and longevity suffers as a result.
Landrover acknowledged this at the rear and fitted the P38 4-gear diff to LWB TD5 and TDCi Defenders, and sort-of acknowledged it further by then designing the 4-gear Rover pattern diff to fit the standard diff carrier, and even said that the 4-gear diff would be standard in the front of the LWB vehicles. I have never seen an explanation why, after doing and saying this, they clearly failed to fit them them in a great many LWB vehicles. The relative weakness of the Rover pattern diff has been known for years, which is why the IIB had ENV axles, the earlier LWB and uprated vehicles had Salisbury diffs. One can only assume really that towards the end the people who worked at Landrover were too stupid to understand the engineering learned by their predecessors or simply didn't care. |
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31st Oct 2020 5:24pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1822  
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Just an update, it is possible to check for impending doom through the filler with a little inspection camera, probably better to drain the oil and flush with a spray of paraffin or similar to be 100% |
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16th Jan 2021 5:51pm |
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