llenroccc Posted October 1, 2012 Posted October 1, 2012 I have a 8070, the V8 engine looks cool. However, my V8 engine sometimes give me trouble. The gear and axle connecting to the crankshaft will move out and lose connection, especially when the car go forward and then backward. I searched online and did not find anyone with the same problem. Did I do something wrong? I feel like it is because the part 4119474 (the crankshaft) only has 0.5 length to connect with the axle. Thank you for any advice! Quote
Lost_In_Noise Posted October 1, 2012 Posted October 1, 2012 (edited) I have a 8070, the V8 engine looks cool. However, my V8 engine sometimes give me trouble. The gear and axle connecting to the crankshaft will move out and lose connection, especially when the car go forward and then backward. I searched online and did not find anyone with the same problem. Did I do something wrong? I feel like it is because the part 4119474 (the crankshaft) only has 0.5 length to connect with the axle. Thank you for any advice! I've had lots of problems with this as well. The engine makes a horrible grinding noise when the car is pushed over a surface. My problem was that the upper 16T gear to the crankshaft was popping out of place, and misaligned with the drive axle. If you replace the 4 axle with bush in step 8, page 24 in book 2 with a 5 axle, and add a bush to the end, the problem disappears. Edited October 1, 2012 by Lost_In_Noise Quote
Phoxtane Posted October 1, 2012 Posted October 1, 2012 I got this set a couple months ago. I didn't have any problems with this gear [admittedly, it didn't stay put together for long]. Maybe yours was just a tiny bit loose. Quote
Paul B Technic Posted October 1, 2012 Posted October 1, 2012 I had the same problem, used a 5 axle and a brush and all was OK after that. Quote
sama Posted October 2, 2012 Posted October 2, 2012 This happens because there is only a half stud connection with the crankshaft and the axle so if you go forwards and then suddenly backwards or if you accelerate the car quickly, it pops out. Quote
llenroccc Posted October 2, 2012 Author Posted October 2, 2012 I've had lots of problems with this as well. The engine makes a horrible grinding noise when the car is pushed over a surface. My problem was that the upper 16T gear to the crankshaft was popping out of place, and misaligned with the drive axle. If you replace the 4 axle with bush in step 8, page 24 in book 2 with a 5 axle, and add a bush to the end, the problem disappears. I tried it and actually it works! Thank you so much!!! Do you know why? Is it because the increased length and mass actually increase the friction (due to slight change of the center of the mass)??? Quote
llenroccc Posted October 2, 2012 Author Posted October 2, 2012 Can forum manager delete my redundant post from #6-9! Thank you! Quote
Lost_In_Noise Posted October 2, 2012 Posted October 2, 2012 (...slight change of the center of the mass)??? Yep that's probably it. It's strange though, that it didn't happen the first time I assembled the model Quote
Alasdair Ryan Posted October 2, 2012 Posted October 2, 2012 (edited) - Edited October 2, 2012 by Alasdair Ryan Quote
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