Saito 80 GK blown up
11-14-2008, 10:57 PM
#26
RE: Saito 80 GK blown up
ORIGINAL: gkamysz
That's an odd defect. You're positive the rear bearing was fully seated? I mean the parts are made to a certain size. If the bore for the front bearing was too deep, it should have been rejected before assembly. That problem just doesn't sound right. Either the bearings or the crank weren't seated correctly.
I had an NIB OS FS-26 that rubbed the backplate. It turned out the crank was an unusually tight fit in the bearings and wasn't fully seated.
ORIGINAL: rcdude7
I just put new bearings in a saito 150 and I guess the front bearing seated slightly deeper than the orignal because I now have rod contact with the backplate. I took care of that clearance problem with a pnumatic die grinder w/sanding disk on the backplate. No more interferance problem!
I just put new bearings in a saito 150 and I guess the front bearing seated slightly deeper than the orignal because I now have rod contact with the backplate. I took care of that clearance problem with a pnumatic die grinder w/sanding disk on the backplate. No more interferance problem!
That's an odd defect. You're positive the rear bearing was fully seated? I mean the parts are made to a certain size. If the bore for the front bearing was too deep, it should have been rejected before assembly. That problem just doesn't sound right. Either the bearings or the crank weren't seated correctly.
I had an NIB OS FS-26 that rubbed the backplate. It turned out the crank was an unusually tight fit in the bearings and wasn't fully seated.
11-14-2008, 11:30 PM
#27
Senior Member
RE: Saito 80 GK blown up
ORIGINAL: captinjohn
Did you measure the width of old and new bearings with a micrometer?
Did you measure the width of old and new bearings with a micrometer?
For example, early MVVS .61 engines used the 16002 rear bearing (32x15x8 mm).
Later MVVS big-block engines (.61, .77 and .91) now all use the 6002 rear bearing (32x15x9 mm)...
The inner and outer diameters are identical, but not the thickness...
The later, wider bearing has a 30% higher dynamic load rating, to withstand the higher loads imposed upon it by the larger .77 and .91 displacements.
But if you happen to own an older MVVS .61 that has worn its bearings out (that will be the day...), please note that the rear bearing will not fit into the crankcase...
...Neither will the new front bearing, but it has 1 mm larger diameters and the same thickness...
11-20-2008, 11:17 PM
#28
Thread Starter
My Feedback: (61)
Join Date: Apr 2002
Location: Wolfforth TX
Posts: 274
Likes: 0
Received 0 Likes
on
0 Posts
RE: Saito 80 GK blown up
Just an up-date for you on this engine of mine. I recieved the new connecting rod from my LHS today. and the new rod does not have the bronze bushing in it, as the original equipment had. and seems to be a lot thicker on the bottom end. I am guessing this is because it is not bored for the bushing. all went back together in just minutes, and I never had to pull the piston out of the bore. just slid it out far enought to get the wrist pin and teflon buttons back in place. oiled it up good as I went and adjusted the valve lash. Great compression and smooth operation again..Thanks for all the guys that tried to answer, and to those that got off subject a little, this is a great forum on a great site.
Don//
11-21-2008, 08:13 AM
#30
Senior Member
RE: Saito 80 GK blown up
ORIGINAL: w8ye
I see where there has been rust?
ORIGINAL: Hobbsy
Dar, here is my pre 1990 .80GK, it does have a bronze bushing and I believe my circa 1991 1.50 also has a bushed rod, I think they are the only ones I have with bushings.
Dar, here is my pre 1990 .80GK, it does have a bronze bushing and I believe my circa 1991 1.50 also has a bushed rod, I think they are the only ones I have with bushings.
