Paul De Tourtoulon Posted January 28, 2022 Share Posted January 28, 2022 9 hours ago, Fin 35 said: I didn't intend to dismantle the engine, just to remove the backplate to check for swarf. I've only started doing this recently after a bad experience with a new engine that gouged the piston very badly on the first flick with fuel in it, but that's another story. 9 hours ago, Fin 35 said: And right too with some engines I used to clean out my' Italian' engines, commonly full of swarf and filings,,,? Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted January 28, 2022 Share Posted January 28, 2022 Swarf... Had a new magnum gp40 that had glass beads inside and outside...not good. I reported it to the supplier and heard nothing for about a month... I stripped cleaned reassembled and run, I still have that engine which is a bit worn after many gallons of fuel having run thru it, it still runs well. Then, a new engine arrived by post, guess what, that was covered in glass beads also... Deaf ears...or blind eyes. Inform saito to see what they say/think/do... Quote Link to comment Share on other sites More sharing options...
Fin 35 Posted January 28, 2022 Author Share Posted January 28, 2022 Just to be clear, the engine that gouged its piston was not a Saito. Both of the Saitos I've referred to here were perfectly clean inside and out, and nicely greased for their first run. My only concern with them was the line on the conrod and I think we have cleared that up - literally! Quote Link to comment Share on other sites More sharing options...
Ernie Posted January 28, 2022 Share Posted January 28, 2022 Maybe Mr Saito will send a post to give us all a detailed insight into whats going on. He might also let us know about current developments at the factory ernie Quote Link to comment Share on other sites More sharing options...
DaveB1 Posted January 28, 2022 Share Posted January 28, 2022 Here's an example of a rod when they do let go. This happened in the production test of a 60L Diesel last week, ( quite a big un ). A very rare event but made a bit of a mess. The big end bearing picked up and siezed, leading to massive overheating until the joint fails and the cap comes off before all hell breaks loose. The rod shank itself is still in one piece albeit slighty reformed ? 1 Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted January 28, 2022 Share Posted January 28, 2022 47 minutes ago, DaveB1 said: Here's an example of a rod when they do let go. This happened in the production test of a 60L Diesel last week, ( quite a big un ). A very rare event but made a bit of a mess. The big end bearing picked up and siezed, leading to massive overheating until the joint fails and the cap comes off before all hell breaks loose. The rod shank itself is still in one piece albeit slighty reformed ? A mere scratch, nothing a Bédouin couldn't repair in the desert with a hammer and chisel,,, Quote Link to comment Share on other sites More sharing options...
Jon H Posted January 28, 2022 Share Posted January 28, 2022 A few laser rods that died. Laser 70 on the left, crank pin was rusty and it picked up the bearing. 360v on the right, another failed petrol conversion. The bending and discolouration of a seizure failure is very clear. I think Pauls Saito rod failure is a fatigue failure at the oil hole as there are no signs of seizure in his photo. 1 Quote Link to comment Share on other sites More sharing options...
Fin 35 Posted January 28, 2022 Author Share Posted January 28, 2022 The spare conrod that I ordered (before the polishing exercise) arrived today. It has the same casting/forging line as the others but it's generally a bit neater. It's tempting fate but I doubt I will ever need it. Quote Link to comment Share on other sites More sharing options...
Rich Griff Posted January 28, 2022 Share Posted January 28, 2022 Could you post 4 views please, front, left side, back and right side please... Nice pictures of failed rods, for what ever reason. BMW bikes, black museum, s shaped rod... Email saito, see what they say ? Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted January 28, 2022 Share Posted January 28, 2022 That definitely looks like a fault in a die used . Polished out should be fine. Still find it not really acceptable to run bare alloy bearings . You would expect it from a low cost Chinese product but not from Saito . Quote Link to comment Share on other sites More sharing options...
Mike T Posted January 28, 2022 Share Posted January 28, 2022 22 hours ago, Jon - Laser Engines said: Honestly, i have to wonder why anyone is dismantling a brand new engine in the first place. ... ... i wouldnt be running the engine with a rod that looked like that. So how do you decide the latter without doing the former? ? Quote Link to comment Share on other sites More sharing options...
Jon H Posted January 28, 2022 Share Posted January 28, 2022 43 minutes ago, Mike T said: So how do you decide the latter without doing the former? ? ignorance is bliss ? 2 Quote Link to comment Share on other sites More sharing options...
John Stainforth Posted January 28, 2022 Share Posted January 28, 2022 I thought the consensus was that this mark was cosmetic, because it sanded out. Is it not possible that it is a deliberate mark to ensure the con-rod is mounted the right way, or to assist with the timing alignment? Quote Link to comment Share on other sites More sharing options...
Martin Arnold 1 Posted January 28, 2022 Share Posted January 28, 2022 No Saito rods have a dimple that should face forward. Quote Link to comment Share on other sites More sharing options...
John Stainforth Posted January 28, 2022 Share Posted January 28, 2022 6 minutes ago, Martin Arnold 1 said: No Saito rods have a dimple that should face forward. Does that preclude a mark on the other side? Also, could it be that conrods for different Saito engines are marked in different ways so that they don't get put into the wrong engines! Quote Link to comment Share on other sites More sharing options...
Martin Arnold 1 Posted January 28, 2022 Share Posted January 28, 2022 (edited) All saito singles are pretty much the same, here is an 82 rod, having a mark on both sides would just confuse things...... Simple dot faces forward. Edited January 28, 2022 by Martin Arnold 1 Quote Link to comment Share on other sites More sharing options...
Nick Cripps Posted January 28, 2022 Share Posted January 28, 2022 Nice big chamfer on the bush is a bit of a giveaway, too... Quote Link to comment Share on other sites More sharing options...
John Stainforth Posted January 28, 2022 Share Posted January 28, 2022 26 minutes ago, Martin Arnold 1 said: All saito singles are pretty much the same, here is an 82 rod, having a mark on both sides would just confuse things...... Simple dot faces forward. The six different Saitos I have (from 72 to 180) have different strokes, so I expect the con-rods are generally of different lengths, even if this is rather subtle - hence perhaps a need to differentiate them in other ways. Quote Link to comment Share on other sites More sharing options...
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