jackd
Senior Member
I heard that these engines weren't such a wonderful deal after all. It would seem that some unscrupulous engine overhaul contractor down in the states had bid on the job to rebuild these engines just before the Mars went out of service - knowing full well that these engines would not be going into service. When some of these 'overhauled' engines were put on wing, they wouldn't last a day. Luckily Standard Aero in Winnipeg was gearing up to do the Wright 3350's for the Canadair Argus which was going into service at the time. The FIFT 3350's were slotted into the assembly line alongside the Turbo-compound beasts from the Argus and when they opened them up they found very low quality work - yes they were painted on the outside but little else was done. I read somewhere that the engine case line up dowels were peened over because they used hammers to put the engines together. Oh they looked good from the outside.....
When the Argus was being retired in the early '80s, Bristol did a last big run of overhauls before they shut down the maintenance line. I heard for the maintenance guys at FIFT back several years ago, that an engine that they put on wing didn't last a day because someone left a loose nut inside the induction section and the supercharger impeller sent it right through the side case. Another great story was how they were destroying those Curtis prop blades during early service with FIFT. The prop blades had a rubber vibration damper bonded inside the blade - they kept finding rubber being extruded from the blade end drain holes which meant the rubber was disbonding. A real head scratcher this one was and they were going through blades big time. One day some old bugger drives up - some retired maintenance engineer who worked on the Mars back in US Navy service. They picked his brain and explained their problem with the props and he asked what max RPM they were running them at. They replied with some number and he responded with no wonder this was happening - you're running the props too fast, bring them down a bit. They took his suggestion and the prop issue went away.
I'm not sure where I'm getting this from, but I believe this is all true. It could have been gleened from maintenance guys over a beer at the West Bay or from my old pal. If anyone knows more than me, go right ahead and chime in.
When the Argus was being retired in the early '80s, Bristol did a last big run of overhauls before they shut down the maintenance line. I heard for the maintenance guys at FIFT back several years ago, that an engine that they put on wing didn't last a day because someone left a loose nut inside the induction section and the supercharger impeller sent it right through the side case. Another great story was how they were destroying those Curtis prop blades during early service with FIFT. The prop blades had a rubber vibration damper bonded inside the blade - they kept finding rubber being extruded from the blade end drain holes which meant the rubber was disbonding. A real head scratcher this one was and they were going through blades big time. One day some old bugger drives up - some retired maintenance engineer who worked on the Mars back in US Navy service. They picked his brain and explained their problem with the props and he asked what max RPM they were running them at. They replied with some number and he responded with no wonder this was happening - you're running the props too fast, bring them down a bit. They took his suggestion and the prop issue went away.
I'm not sure where I'm getting this from, but I believe this is all true. It could have been gleened from maintenance guys over a beer at the West Bay or from my old pal. If anyone knows more than me, go right ahead and chime in.