« 240の耐久性について考える ~総括編~ | Main | プライウッドのトレー。 »

December 10, 2006

240のホイールナット。

240のホイールナットのねじ山は非常にナメやすい。
無闇に強いトルクを掛けると簡単にねじ山が潰れてしまう。
その事を知らないカーショップにタイヤ交換を依頼すると、インパクトレンチとか持ち出してガンガン緩めたり締めたりするものだから堪らない。馬鹿トルクを掛けられるとあっさりとねじ山が変形してしまう。。

変形したねじ山をそのまま放置していると、タイヤ脱着時に違和感を感じるようになってくる。
ホイールナットを回すと、最初は『何だか堅いな』と思う程度だが、繰り返し脱着しているとどんどん症状が悪化してきて、手で回す事が不可能になる。ついには工具で無理矢理回すような状態になり、最終的にスタッドボルトがねじ切れたり、徐々に弱ってきたボルトが走行中に折損して、タイヤが脱落する危険性もある。

なので私は定期的にネジ山をタップやダイスで補修するようにしている。
愛用しているのは『SNAP ON』のタップ&ダイスセット。

この工具の優れている点は、ラチェットハンドルで回せるという点。通常のタップやダイスはハンドルに固定して回すのだが、それだと隣接したハブボルトが邪魔になって上手く回すことが出来ない。一方、このスナップオンは六角になっているのでラチェットにコマを接続すれば普通のボルトの様にクルクル回すことが出来るのだ。

今日はこのスナップオンを用いて240のホイールナットを補修した。

使用したタップは1/2インチのピッチ20。17ミリのコマをラチェットに接続し、ナット側を19ミリのクロスレンチに固定してクルクル回す。すると髪の毛のような金属片が大量に出てくる、出てくる。最終的に手の力で軽々回せるようになるまで削って完了。これで暫くは安心してホイールの脱着が出来る。

240のホイールナットは非常に痛みやすいので定期的なねじ山修正が不可欠。結構痛んでホイールナットの締め込み時に異常な力を必要とする240が多いので一度チェックしてみて下さい。

手で回して最後の締め込みのみ工具を用いるのが本来の姿です。締め込み途中で工具が必要な場合、明らかにねじ山に何らかの不具合が生じています。放置し続けるとハブボルトの金属疲労が蓄積し、走行中に折損する可能性も出てきます。

240に乗る上での要注意ポイントの一つです。
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Comments

こんにちはvolnakさん。
いつも、いや、ほとんど毎日こちらを拝見させて頂いていますthawと申します。
僕も今年の春に240を購入し、心配だったウインターシーズンも難なく過せそうで一安心と思っていたのですが・・・シーズン前に冬タイヤに交換した時、おっしゃる通りナットが緩まない・・レンチの腕を伸ばし力を込めての脱着・・。
交換後、義父に『締めすぎは良くないぞ・・』などとボソッと言われる始末。しばらくは気にしていなかったのですがvolnakさんの記事を拝見し、春のタイヤ交換時が今からドキドキです・・笑)
知識を持って行なうのか、そうでないのかの差は大きいですねぇ。

Posted by: thaw | December 16, 2006 at 02:54 PM

thawさん、はじめまして。

今まで色々なクルマのタイヤを脱着してきたのですが、240のナットは非常に痛みやすいです。すぐにネジ山が変形して上手く噛み合わなくなってくるので、定期的にネジ山をタップ&ダイスで補修しています。

他のクルマではこの様な症状は皆無だったので、きっと240の工作精度の低さならではの事象だと思います。新品のナットをディーラーで購入したこともあるのですが、ハブボルトが痛んでいたせいかスグに駄目になりました。まあ、そういう所が可愛かったりするのですが。笑。

ネジ山修正は結構面倒なので、ショップ等では中々やってくれないと思いますので、DIYメンテとしてたまに実施すると良いと思います。

あとホイールナットには装着方向があるのですが、プロでもたまに間違える人がいるので要注意です。少し出っ張っている方をホイール側にして装着しないとスグに緩んでくるし、ネジ山も痛んでしまいます。

タイヤ交換の際は、気をつけてください。

Posted by: volnak | December 16, 2006 at 09:43 PM

volnakさん、適切なアドバイスに感謝いたします。ありがとうございます。
僕は、てっきりボルトのネジ山も伸びてしまったのかなぁ? などと・・
ナットでしたら最悪は交換出来ますね。義父に聞くとボルトも面倒だけど交換出来るらしいし・・(僕に出来るかは疑問ですが・・笑)
来春には点検と思っていましたが、その前にスタッドレスタイヤがヤレてきたので履き替えしなければと考えております。それでは、またお邪魔させて頂きます。

PS:お子さんスクスクと育っているようで・・僕にも息子がいます。もう高校生ですが・・それでも息子と義父と楽しく車の話に花を咲かせております。今は240以外にもう一台、チョコチョコ走れそうな車を選定中です。アウトビアンキA112アバルトあたりが良いかなぁ〜などと妄想しております・・

Posted by: thaw | December 17, 2006 at 06:25 PM

こんばんは。

自分の240もナットだけでなく、ハブボルトも痛んでます。なので定期的にダイスで補修してます。面倒ですが240に乗る上での儀式?として実施してます。苦笑。

アウトビンキ良いですね!
最近あまり見掛けない点も通っぽくて良いと思います。
目立ちすぎず、分かる人には分かるとういう感じが自分も大好きです。

Posted by: volnak | December 17, 2006 at 10:19 PM

 以前車輌管理をしていた人に聞いたところ、
1 ハブボルトをきれいにして、オイルやグリースを塗って締める。
2 ナットは一筆書きの☆の順番でで、3回に分けて締める。
3 力が入りすぎるので、上げ締めはしない。
4 純正の車載工具のレンチで締める。
  と よいそうです。私は、トルクレンチも使い始めましたところで  す。タップ&ダイスの修正セットも注文してしまいました。長く乗らねば。

Posted by: 240ブルー | December 19, 2006 at 08:12 PM

240ブルーさん、コメント有難うございます。

ホイールナットの扱い参考にさせて頂きます。

タップ&ダイスセットは一つ持っておくと240イジリの際、安心感が高まると思います。ホイールナットの他にも色々なボルト&ナットの噛み合いがイマイチなので、きっと役立つと思います。

ブレーキラインやATFゲージパイプ、プラグや各アースポイント等もなかなか一山目がハマらない事があるので、いつかナメてしまいそうで心配。。

お互い永く240乗りましょう。

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