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Technical
Starter bushes slow cranking when hot
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<blockquote data-quote="starbiscuit" data-source="post: 605980" data-attributes="member: 18416"><p>When I had the "slow crank when hot" problem I eventually changed the starter bush in the bell-housing (1600 SP)</p><p>I replaced my earth straps first, but it made little difference.</p><p></p><p>It's a 10 minute job to unbolt the starter, then wind a 12mm tap (IIIRC) into the bush until it bottoms out and pushes out the bush.</p><p>Then press in the new one, being careful not to drop it into the void.</p><p></p><p>I couldn't believe it would fix the problem, but it certainly did.</p><p></p><p>The theory (as I understood it, and which may be nonsense) is that when everything is heat-soaked and expanded, the starter shaft can move more side-to-side than when it's cold, especially in worn bushing. Even a small deflection massively reduces the magnetic field, which kills the torque.</p><p></p><p>I believe you can now get self-supporting starter motors that don't need the bush in the bell-housing and therefore won't suffer the same problem.</p><p></p><p>But the bush is much cheaper than a starter motor.</p></blockquote><p></p>
[QUOTE="starbiscuit, post: 605980, member: 18416"] When I had the "slow crank when hot" problem I eventually changed the starter bush in the bell-housing (1600 SP) I replaced my earth straps first, but it made little difference. It's a 10 minute job to unbolt the starter, then wind a 12mm tap (IIIRC) into the bush until it bottoms out and pushes out the bush. Then press in the new one, being careful not to drop it into the void. I couldn't believe it would fix the problem, but it certainly did. The theory (as I understood it, and which may be nonsense) is that when everything is heat-soaked and expanded, the starter shaft can move more side-to-side than when it's cold, especially in worn bushing. Even a small deflection massively reduces the magnetic field, which kills the torque. I believe you can now get self-supporting starter motors that don't need the bush in the bell-housing and therefore won't suffer the same problem. But the bush is much cheaper than a starter motor. [/QUOTE]
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Starter bushes slow cranking when hot
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