<div dir="ltr">I bought a very secondhand Mk3 Ford Cortina to replace the Mini I had rolled (!) and changed the belt of unknown age and mileage sometime during my ownership with no drama except learning that engine/cam timing was a different thing to ignition timing.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 6 May 2022 at 04:03, Rick Fisk via Spridgets <<a href="mailto:spridgets@autox.team.net">spridgets@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div dir="ltr"></div><div dir="ltr">I bought a new Fiat X1/9 in 1975. The timing belt was supposed to be changed every 50,000 miles. At 40,000 miles I sold the car to a girlfriend. At 53,000 miles the belt broke with the engine running at idle while she was waiting for a red light. At least half of the valves were bent.</div><div dir="ltr"><br><blockquote type="cite">On May 5, 2022, at 10:19 PM, Greg Higgins via Spridgets <<a href="mailto:spridgets@autox.team.net" target="_blank">spridgets@autox.team.net</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">I owned a 1977 Honda Civic with a 1.2 litre engine, I bought the car new. The<div>timing belt had to be changed every 50.000 miles on that model. I was 6000 miles</div><div>over the timing belt's best before mileage. The timing belt broke while going to work one afternoon.</div><div>There was no damage to the engine, a new belt and I was good to go. I made sure I was under</div><div>50,000 miles when I replaced that one. Lesson learned.</div><div><br></div><div>Greg Higgins</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 5, 2022 at 4:46 PM Michael MacLean via Spridgets <<a href="mailto:spridgets@autox.team.net" target="_blank">spridgets@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">I don’t suppose having 1.5 rockers helps the situation much either.<div dir="auto">Mike M</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, May 5, 2022, 1:41 PM Weslake1330 <<a href="mailto:weslake1330@gmail.com" target="_blank">weslake1330@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I always thought it depended on the cam and rockers whether or not the valves would hit the piston if the belt broke on an A-series. A long time ago my dyno guy said for my engine if the belt broke the valves would definitely hit the piston. No, I don't have the full valve lift figure handy.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 5 May 2022 at 20:16, Rick Fisk via Spridgets <<a href="mailto:spridgets@autox.team.net" rel="noreferrer" target="_blank">spridgets@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Forgot to add both valves were bent as well.<br>
<br>
> On May 5, 2022, at 3:01 PM, Rick Fisk <<a href="mailto:refisk@chartermi.net" rel="noreferrer" target="_blank">refisk@chartermi.net</a>> wrote:<br>
> <br>
> Yes, the 1275 is an interference engine. In this photo you can see where the valves beat the crap out of the top of the piston. The piston broke in half at the wrist pin and the top half of the piston stayed at the top of the bore.<br>
> <br>
> <br>
> <br>
>> On May 5, 2022, at 2:41 PM, Michael MacLean via Spridgets <<a href="mailto:spridgets@autox.team.net" rel="noreferrer" target="_blank">spridgets@autox.team.net</a>> wrote:<br>
>> <br>
>> <br>
>> When I rebuilt my 1275 for the Bugeye I converted to belt drive for timing. Keeps the timing spot on. It occurs to me that like other cars the timing belt has a limited life and must be changed. To be honest the instructions did not say when this should occur as far as I can remember. To be fair, the rebuilt engine has only a little over 3K miles on it, but the question arises about valve interference if the belt breaks. To my knowledge, I don't think so, but I have been proven wrong before. Anyone know if a 1275 would be an interference engine if the belt broke?<br>
>> Mike MacLean<br>
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