Which Sachs is this?
02-19-2006, 03:58 PM
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RE: Which Sachs is this?
Best guess is an early A&M 4.2, before the 4.2 MKII....Look at the cylinder, a 4.2 will have 49ZN cast into it...
I don't think anyone made 3.7s with machined cases...I think Walker changed the bolt pattern in the crankcase, the bottom 2 case bolts are parallel on a Walker, A&M just copied the chainsaw bolt pattern...
If you can see the con rod it should be copper colored..A steel colored con rod is an A&M or Brison...Doesn't look like a Brison hub..
I don't think anyone made 3.7s with machined cases...I think Walker changed the bolt pattern in the crankcase, the bottom 2 case bolts are parallel on a Walker, A&M just copied the chainsaw bolt pattern...
If you can see the con rod it should be copper colored..A steel colored con rod is an A&M or Brison...Doesn't look like a Brison hub..
02-19-2006, 05:08 PM
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RE: Which Sachs is this?
Judging by the a size comparison of the screwdriver handle to the engine, it will be hard pressed to make a 4.2, let alone a 5.8. But that could be a really big screwdriver handle! Definately not a Brison hub. Perhaps a Walker timing ring. A&M/Brison style case.
02-19-2006, 05:15 PM
#7
RE: Which Sachs is this?
The seller is located pretty far from me so that's not really an option. I was hoping someone would recognize the engine quickly, if I can't determine what it is I will pass on it.
ORIGINAL: krayzc-RCU
will the owner bolt it up to something so that you can see what are the prop numbers/what prop it runs?
will the owner bolt it up to something so that you can see what are the prop numbers/what prop it runs?
02-19-2006, 05:25 PM
#9
RE: Which Sachs is this?
Good idea! I'll ask if there are any numbers on it.
ORIGINAL: Silversurfer
See if there is a number cast on the cylinder boss, usually at the rear side, but not always. Toss that number out here and Ralph or some of the others with a long knowledge history or party manuals may be able to help.
See if there is a number cast on the cylinder boss, usually at the rear side, but not always. Toss that number out here and Ralph or some of the others with a long knowledge history or party manuals may be able to help.
02-19-2006, 05:27 PM
#10
RE: Which Sachs is this?
Ask the seller to measure the bore and stroke for you.
Put the numbers up here and me or someone else can do the math for you.
If the guy won't measure the bore and stroke--then he's hiding something. It's NOT rocket science to figure out the displacement of an engine.
Put the numbers up here and me or someone else can do the math for you.
If the guy won't measure the bore and stroke--then he's hiding something. It's NOT rocket science to figure out the displacement of an engine.
02-19-2006, 10:44 PM
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RE: Which Sachs is this?
Pretty sure all Walkers had the machined pockets on the front of the case like the one pictured. Timing ring also looks like a Walker. Ralph is right, not a 3.2 or 4.2.
02-20-2006, 04:20 PM
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RE: Which Sachs is this?
Hi Mendes It looks like a 5.8 to me. is the added single bolt adapter held on with 6 flathead bolts? If it is, you will have to use the 6 bolt hub to mount the prop. The single bolt hub will never hold the prop when the throttle goes up and down. In other words, the prop will be in a different position when you land. If you use wood props, the bolts will have to be checked for titeness about every 3 flights. The carbon fibre props are not nearly as crushable as the wooden ones, and seem to not need the checking. The reason for this is, the wood tends to yield under pressure from the bolts. If the bolts are not retightened regularly, the bolts will drive the prop, instead of the hub. This is what causes the prop to be split length wise when the throttle goes from low to high, and vice versa. On some props, I have glued hardwood dowels in all 6 holes, and redrilled the prop, this helps with the crushing problem. hope this helps regards jack
02-20-2006, 06:35 PM
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RE: Which Sachs is this?
Pretty sure it is not a 5.8. The 5.8 would have a big "cyclops" looking hole in the upper front of the cylinder. It's a boss where the original motor had a soft mount in a saw.
Here's a pic of an FPE 5.8, & a Brison 5.8. They are also Sachs/Makita based engines.
Here's a pic of an FPE 5.8, & a Brison 5.8. They are also Sachs/Makita based engines.
02-20-2006, 09:39 PM
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RE: Which Sachs is this?
The big hole is in the later cylinders...Early 5.8s had no hole...
Sachs cylinders 101
Sachs model 133 chainsaw, 5.2 cubic inches..Cylinder by Kolbenschmidt # R133131021
Sachs model 143 chainsaw, 5.8 cubic inches..Cylinder by Kolbenschmidt # R031131011
The 143 cylinder has a boss cast near the top of the cylinder between the third and fourth fins, maybe for a compression release...
The 133 cylinder has 929/1B cast into the base above the numbers
The 143 cylinder has 121/1C cast into the base on the opposite side
Both have the same exhaust bolt pattern as the picture, and the same carb insulator block bolt pattern 2 at the top, one at the left bottom...4.2s are different...
Sachs cylinders 101
Sachs model 133 chainsaw, 5.2 cubic inches..Cylinder by Kolbenschmidt # R133131021
Sachs model 143 chainsaw, 5.8 cubic inches..Cylinder by Kolbenschmidt # R031131011
The 143 cylinder has a boss cast near the top of the cylinder between the third and fourth fins, maybe for a compression release...
The 133 cylinder has 929/1B cast into the base above the numbers
The 143 cylinder has 121/1C cast into the base on the opposite side
Both have the same exhaust bolt pattern as the picture, and the same carb insulator block bolt pattern 2 at the top, one at the left bottom...4.2s are different...
02-22-2006, 04:53 PM
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RE: Which Sachs is this?
The boss is for a compression valve which made the saw a "Happy Start" in the model 343 concrete line and it is trure that early engines did not have that, by early that means Reagan years. 5.8 pistons also were flat on top and 5.2 were sort of domed with a dish. Engine is quite likely a 5.8.
