エンジン分解 異音究明
- 「･122」AMAZON健康維持大作戦
- by suna
- 2009/10/30 金 00:05
本日、中野の工場へ行き、Ｎさんのご好意でお借りしたスペアエンジンを搭載した「・１２２」ＡＭＡＺＯＮと対面してきました。お借りしたエンジンは、ここ数年動かしていなかったこともあり、いささかの心配もあったのですが、入念なエンジンへのオイルまわしと、入念なエンジンオイルのフラッシング、そして、エンジンブロック内の冷却系の洗浄を行い、搭載しました。当初ウォーターポンプまわりから若干の水漏れも見られたのですが、徐々に暖気をし、慣らしていくうちに、水漏れも止まり、やはり、最初に出ていた排気ガスの白煙もおさまり、快調そのもの。差し当たって、大事に使えば、このままでも、充分に走ってくれそうです。で、代わりに下ろした、「・１２２」の異音を発するエンジンも、分解しました。その結果、案の定、「異音のもと」は、カムギアでした。エンジン前部にあって、エンジンのタイミングギアを駆動するベークライト製のカムギアの中心軸受け部分の円心が剥離してガタガタ、ブラブラになっていました。カムギアはスパイラルギアなので、トルクが掛かっている時は、ガタガタ、ブラブラでもエンジン側に押し付けられるのですが、トルクが切れると、ギア自体が、ガタガタ、ブラブラに遊んでいる状態で、これが異音のもとでした。さらに、ロッカーアームもかなり偏磨耗していましたし、ピストンヘッドもカーボンで真っ黒。とくに、４本のピストンの汚れ具合のアンバランスに、エンジンが「病んでいた」証が見受けられました。この際、エンジンをボーリングし、必要部品を交換し、一気にオーバーホールをするつもりです。今週は、仕事で多忙なため、来週には、ＡＭＡＺＯＮ１２３ＧＴのＯさん、ＡＭＡＺＯＮ博士のＮさんのお知恵を拝借し、ご指導賜りながら、スウェーデンとアメリカに部品の発注を行う予定です。
I went to the workshop in Nakano today to see my Amazon with the spare engine borrowed from Mr. N. The spare engine hadn't been use in quite a while, so oil was gently circulated, the engine oil was flushed, and the cooling system cleaned. At first, there was some water comingout from the water pump, but as the engine started to warm up the water stopped, and the white exhaust disappeared. If I do not over use the engine, I think I can go about now. At the same time, the actual .122 engine was going thru dismantling. The strange noise that the engine had been emitting was indeed the cam gear. The gear is towards the front of the engine and the center part of the gear which is made of Bakelite had started to fall off, making the gear become loose. Since the cam gear is a spiral gear, once the torque goes up, it gets pushed against the engine so the noise goes down, but once the torque goes down, then the gear starts uttering noises. It turned out that the rocker arm was also starting to wear down as well as the piston heads being all black. The blackness of the pistons was very unequally distributed, and is the proof how "sick" the engine was. I will be tied up this week so I will start ordering parts from Sweden and the US next week, asking for advice from Mr N.(Dr. Amazon) and Mr. O (123GT).
I went to the workshop in Nakano today to see my Amazon with the spare engine borrowed from Mr. N. The spare engine hadn't been use in quite a while, so oil was gently circulated, the engine oil was flushed, and the cooling system cleaned. At first, there was some water comingout from the water pump, but as the engine started to warm up the water stopped, and the white exhaust disappeared. If I do not over use the engine, I think I can go about now. At the same time, the actual .122 engine was going thru dismantling. The strange noise that the engine had been emitting was indeed the cam gear. The gear is towards the front of the engine and the center part of the gear which is made of Bakelite had started to fall off, making the gear become loose. Since the cam gear is a spiral gear, once the torque goes up, it gets pushed against the engine so the noise goes down, but once the torque goes down, then the gear starts uttering noises. It turned out that the rocker arm was also starting to wear down as well as the piston heads being all black. The blackness of the pistons was very unequally distributed, and is the proof how "sick" the engine was. I will be tied up this week so I will start ordering parts from Sweden and the US next week, asking for advice from Mr N.(Dr. Amazon) and Mr. O (123GT).
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