I'm to that step on my engine, and I dont have the proper tools for measuring the end play. What should I use and where can I find it? How important is this anyways?
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Everybody hold a minute...... the problem here is not that he has to much end play. the problem is that he does not have enough. The larger the end play spacer the more end play you will have. The letter C is smaller then the letter D.. You need to try the letter E and you will be with in specs.
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Originally Posted by net seven' date='Jan 29 2004, 09:17 AM
I'm to that step on my engine, and I dont have the proper tools for measuring the end play. What should I use and where can I find it? How important is this anyways?
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Originally Posted by 93BlackFD' date='Jan 28 2004, 05:31 PM
I did that,
except I used 90 grit (400 took too long) and it went from 3.16 thick to 3.13 thick. Now my end play is .001 That is the point of the 400 paper. It lets you remove small amounts of material in a very slow operation. So you had 0.004" end play with a 0.316 spacer. You needed to remove .001" from the spacer, to get to 0.315" To get to 0.003" end play. In the zone for Mazda and Judge Eto. You removed 0.003" to get a 0.313" spacer, or 0.002" too much. Buy the right spacer. Lynn E. Hanover |
Originally Posted by net seven' date='Jan 29 2004, 01:17 AM
I'm to that step on my engine, and I dont have the proper tools for measuring the end play. What should I use and where can I find it? How important is this anyways?
The thrust bearings are cheap enough that they should be replaced, since it's apart anyway. The bearings control crank end play. If you have a distributor or a crank angle indicator, excess end play alters timing. Too little end play can be reduced to zero when the crank flexes and fail a bearing. You can build the engine with zero end play, or zero with a bunch of preload, and the engine will run fine for a while, but the bearings will fail. Both bearings are used to locate the crank fore and aft. The rear bearing takes the additional load of the clutch release bearing being extended to release the clutch. Very important. Lynn E. Hanover |
the mazda manual says "if the end play is more than specified replace the spacer with a thinner one, if the end play is less than specified, replace the spacer with a thicker one"
i was confused too but i was going by the manual http://www.iluvmyrx7.com/3rdgen/manuals/93...copy;engine.pdf |
what ito said is right only after he removed too much material and got down to .001, he was too big initially.
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Since we're on the topic of the front cover stuff....
I had an 87 TII engine spin the front and rear bearings after a few thousand miles. I believe that what happened is that I put in a very heavy duty pressure plate when I did the rebuild and the 15 year old front thrust plate in the front cover cracked because of this and let things move around too much. When I took the engine apart, the front thrust plate that the thrust bearings ride on was split into two pieces! The needle thrust bearings were all messed up. It could be clearly seen that the side of the eccentric shaft rotor lobe had collided with the flat surface of the front iron plate... there were bad burn marks on the front iron all over the area inside the oil seal tracking marks. It was some major destruction! Ever since then I always use a new thrust plate and I also recommend that people put the "upgraded" thrust bearing in there on an FC. Mazdatrix sells them. They are the same thickness, but they have more needle rollers in them to better take the load. Brian |
Originally Posted by 93BlackFD' date='Jan 29 2004, 12:16 AM
i've been trying to perfect this on the engine
i got .005 the first try with a D spacer then i put in a C spacer, and got .004 i think mazda says the max is .0035, and normal is .0018-.0028 what are opinions on this? how much are these spacers? |
went to rick engman's shop and let him inspect it, he ended up with a C spacer and the end play is .0030, that's perfectly fine
thanks for the help guys https://www.nopistons.com/forums/pub...#>/biggrin.png glad i didn't try to run it with .001 ;-) |
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