Dennis type Z big end bearings
Hi, I'm new to the forum, I'm in the process of re commissioning a 1954 Dennis type Z to working condition, the owner told me the machine was checked and run up after he bought it but after 20 minutes the machine lost power then stopped.
The person running the machine came to the conclusion it had spun a bearing and returned it to the owner, I've now got the machine to diagnose and fix, I've stripped the engine and discovered that the big end bearings have failed, the white metal has parted company from the bronze shell either from corrosion or overheating.
The problem I'm having is sourcing a replacement pair of bearings either new or in usable condition, all places I've contacted either don't have any or in the case of having them re surfaced isn't a cost effective route to take.
It has crossed my mind to source another engine and harvest the bearings and crankshaft but even then its finding one that's cheep enough or isn't seized!
Surely there must be a stock of bearings somewhere after all these machines were manufactured and sold for a long time worldwide. Long story short, does anyone have a pair or can point me in the direction of somewhere that has? It's the only thing that's holding me up now. Many thanks.
Forums
Have you tried the chap who…
Have you tried the chap who advertises Dennis stuff on the back cover of Grassbox ?
Yes, no reply as yet
Yes, no reply as yet
I received a message today…
I received a message today and it's not good news. Big end bearings have never been available, they need to be re surfaced with white metal and then line bored. Unfortunately line boring is out of my league so I'm looking for another solution.
On the upside I have been informed that if the bearings have failed its most likely there's an issue with the oil pump so while I search for a solution I'll service the oil pump and set the tolerances as instructed.
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