Question about Makita HR3851 Electric Rotary Hammer

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Makitahr3851rotary hammer does not turn drill or cycle chisel

Splined sleeve in toolholder is split and does not turn with cylinder liner. Cylinder liner turns OK. Impact bolt is not moving freely. Piston and striker move freely. Motor runs OK.

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  • 304 Answers

Sounds like you need a new tool holder

Posted on Mar 04, 2014

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Posted on Jan 02, 2017

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SOURCE: Makita HP1640 hammer drill dual mode - 2 hours

Exchanged Makita HP1640 hammer drill for a new one. The 2nd drill did the same thing in under an hour!! Will return for refund. Instructions say the Forward/Reverse switch must be in a full up or down position for the Hammer/Rotary switch to move; well, it is and the Hammer/Rotary switch still stops at a 1/2 way point between modes. Although I can still use the drill, instruction warnings say not to because it may potentially burn out the motor. I'll have to go with a different brand this 3rd time around. It seems to be a design flaw.

Posted on Oct 11, 2009

jeffpetree
  • 36 Answers

SOURCE: Makita

possible broken spindle or gear in the gear case

Posted on Aug 29, 2012

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3.1l diesel. What is the correct head gasket?


no year? Jeep? one post, and no year.
is this WG jeep say in europe. ? we dont have WG here.
WG started in Europe in 1999.
on this usa forum or in our country no 3.1 VM diesels
i do have your FSM book.
and here is what it states. (different liners used etc)
"CYLINDER HEAD GASKETS
A one piece steel cylinder head gasket is used for
all five cylinder heads.
Cylinder head gaskets are available in three thicknesses.
Identification holes or notches in the right
front corner of the gasket indicate the thickness of
the gasket (Fig. 65).
CAUTION: Piston protrusion must be measured, to
determine cylinder head gasket thickness, if one or
more cylinder wall liners have been replaced.
NOTE: If cylinder wall liners have not been
removed; the same thickness head gasket removed,
may be used.
MEASURING PISTON PROTRUSION
(1) Use special tool VM.1010 with dial indicator
special tool VM.1013 (Fig. 66).
(2) Bring the piston of cylinder no. 1 exactly to top
dead center.
(3) Zero the dial indicator on the cylinder block
mating surface.
(4) Setup the dial indicator on the piston crown
(above the center of the piston pin) 5mm (1/8 in.)
from the edge of the piston and note the measurement
(Fig. 67).
(5) Repeat the procedure with the rest of the cylinders.
(6) Establish the thickness of the steel gasket for
all four cylinder heads on the basis of the greatest
piston protrusion (Fig. 65)
buy the book,end all guessing?


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Apr 08, 2016 | Jeep Grand Cherokee Cars & Trucks

1 Answer

What is the torque settings for polo bah motor big ends :mains and cylinder head


CHECK BELOW..
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Tightening torques
Bolted connections Tightening torque
Bolts, nuts M 6 10 Nm
M 8 20 Nm
M 10 45 Nm
M 12 60 Nm
Deviating from above
Exhaust pipe to manifold 40 Nm
Installation
Note
t Only remove the new cylinder head gasket from its packing immediately before installing.
t Handle the new gasket with extreme care. Damaging will lead to leaks.
- Place a clean cloth in cylinders so that no dirt or emery cloth particles can get in between cylinder wall and piston.
- Also prevent dirt and emery cloth particles from getting into the coolant.
- Carefully clean cylinder head and cylinder block sealing surfaces. Thereby ensuring that no scoring or scratches are formed (when using abrasive paper the grade must not be less than 100).
- Carefully remove metal particles, emery remains and cloths.
- Set No. 1 cylinder piston to TDC and then turn crankshaft back slightly.
- To centralize, screw guide pins from 3450/1 into front outer holes for cylinder head bolts-flechas-.
- Place the new cylinder head gasket in the centralizing pins -A-. Lettering (Part No.) must be readable.
- Fit cylinder head, screw in 8 remaining cylinder head bolts and tighten by hand.
- Remove the guide pins with tool 3450 by the bolt holes. To do this, turn the tool left until the pins are removed.
- Fit remaining cylinder head bolts and tighten hand-tight.
- Tighten cylinder head in tightening sequence as follows:
- Tighten all bolts to 30 Nm.
- Then tighten all bolts a 1//4 turn (90 °) further using a rigid wrench.
- Then tighten all bolts again a 1/4 turn (90 °) further.
Note
There is no requirement to retighten the cylinder head bolts after repairs.
The rest of the assembly is basically a reverse of the dismantling sequence.
Note
When the camshaft is turned, the crankshaft must not be at TDC. Danger of damage to valves or piston crowns.
Installing toothed belt and adjusting valve timing > Chapter.
Filling with new coolant > Chapter.
- Interrogate fault memory > Chapter.

Feb 21, 2015 | 2006 Volkswagen Polo 1.6

1 Answer

Craftsman Tiller 917.298560 pull cord will not move but rewind starter is ok when removed from the engine. Flywheel will not move when rewind starter is off. It worked one minute but not the next or after....


The Flywheel or the piston may not be frozen up, unless it ran without much oil to the cylinder. After not being used for a while it may have locked itself in place by hitting the old dry spot in the cylinder. Remove the spark plug and spray some lite oil like wd-40 into the cylinder and move the flywheel by hand back and forth until it starts moving freely again. Also would be a good idea to change the old oil. When oil sits up it can collect moisture and cause dilution of the oil and score the cylinder walls at start up and damage the engine. If you cannot move the flywheel by hand, try using a strap wrench. Also a good idea to wear gloves while doing this procedure.

Aug 22, 2013 | Craftsman Tiller Operation Manual...

1 Answer

Changed piston and ring just had my cr 80 2002 cylinder relined it fired up for a split second but wont start now pls help


was piston mated and messured to new liner ? can you compression test it ? 100 psi and above ONLY ! What 2 stroke mix , make did you use ? P...

Jul 09, 2011 | 2002 Honda CR 125 R

2 Answers

Im putting my 05 yz 125 top end back together my question was what is the torque specs on the head and on the jug


G'day. The torque specs for the 8mm head bolts is 18ft/lbs.the jug?(cylinder or barrell) is just tightened down even & firm, as there is no acess for a torque wrench.
OK. other things to note.
Clean the cylinder first in solvent(kero or fuel).Then in warm soapy water in a bucket. Dry-(compressed air is best for this-wear eye protection).once dry lubricate all power valves with oil.
Using a clean white rag-soak the end in your 2 stroke oil & wipe the inside of the cylinder surface untill the rag comes back clean(you will need to do it a couple of times-turn the rag over & do it again).Lube the new piston just before assembly-Also pour a little oil down the main bearing oil holes & over the big end too.
Other things to be sure of are-
Piston on the right way round-arrow to the exhaust.
Rings right way up. Some 2stroke dirtbike rings will only go one way up.Look CLOSELY at the ring ends-on the upper or lower surface there may be an etched dot or "T" or "N" or other marking. the mark goes facing up(on both rings unless single ring piston).
rings positioned with end gaps over the locating pins(the ring grooves have a pin in them to stop the ring turning)
Piston pin clips in correctly.
Powervalve moves freely.
Again-watch when you fit the cylinder-it can be tricky to keep the ring end gaps over the locating pins as you feed the cylinder over the piston.
Hope this all helps
Regards(done this a thousand times)Andrew Porrelli

May 04, 2011 | 2003 Yamaha YZ 250

2 Answers

My Porter Cable FN250A only shoots nails sporadically. When I lift up the nose piece, it appears that the "hammer" is not fully retracting.


Piston not retracting is caused by several issues. Bent or broken driver, worn piston oring or loose or broken check seal. Remove head and examine driver for bent or broken, adjust as needed. Check that piston oring fits snug, piston should not drop down cylinder under its own weight. Pull cylinder from body and check that black band (check seal) is in place around holes in cylinder. Good luck

Oct 26, 2010 | Porter Cable Tools & Hardware - Others

1 Answer

How does clutch work


Your clutch is both complicated and simple ( confused? That's because there are many types and variations of clutches)
OK, I'll give you the simplest version.
When you step on the clutch pedal, it is either attached to mechanical linkage, a cable, or a master cylinder that works the same as the one for your brakes. Jeeps use a master cylinder.
The fluid pressure at the master cylinder pushes a slave cylinder on the bellhousing (just like the wheel cylinder on a drum brake...only difference is that a wheel cylinder has a piston on each end, a clutch slave has one piston) When you make the piston move, it pushes on a part called a clutch fork which is a simple lever...push on one end and the other end travels in the opposite direction. That lever is attached to a bearing (called a throwout bearing) that is positioned around the input shaft of the transmission, sliding back and forth on it. When the bearing is pushed against "fingers" on the clutch pressure plate assembly, it forces the actual plate to move back away from the clutch disc. The disc is normally held tightly sandwhiched between the plate and the flywheel by springs in the plate cover.
Further clamping force is sometimes applied by counter weights on the "fingers" that react to engine rpm. (depending upon clutch design)
So, when you step down on the pedal, you are moving the slave piston, the fork and the bearing which causes the clamping force on the disc to be relieved, allowing it to spin free and since it is connected to the input shaft of the transmission which is splined so the disc (also splined)can drive it. Bottom line is that when the disc is compressed between the flywheel and the pressure plate it turns the transmission gears, moving the car. When you push the clutch pedal down, it releases that pressure and no power goes into the transmission.
Jeep also uses an alternative design that eliminated the clutch fork but essentially everything else still works the same.

Oct 15, 2010 | 2004 Jeep Grand Cherokee

1 Answer

How to fit front master cylinder repair kit on a honda cbx 550 motorcycle. cylinder /lever already removed from bike.


Just remove the lever, gently pull rubber boot out of the body, take a snap ring pliers,and remove the circlip, and pull the piston out of the body. Use the piston as a reference to install the seals correctly on the new piston. Be sure to take out the screw in the reservoir, remove the reservoir, and clean the fluid return pin hole ( Must Be Clear) , next to the large fluid feeder hole. Also using a dowel covered with a lint free cloth gently wipe out the piston sleeve being careful not to scratch the walls ( Do Not Hone The Master Cylinder or it will be ruined). Coat parts with brake fluid before reassembly in reverse order. Cover bike with plastic and put some old rags under master cylinder. Before tightening brake hose bolt, fill the master cylinder with dot 3/4 brake fluid and pump the lever until the master cylinder is pushing fluid out the end where bolt and hose are loosely connected, now tighten bolt holding the brake line on. This will aid greatly in bleeding the system.

Jul 07, 2010 | 1985 Honda CBX

2 Answers

How do i remove crank pulley bolt from 1994 honda accord 2.2 four cylinder? motor turns counterclockwise. does crankbolt turn the same like removing any bolt?


Ok that bolt loosens counterclockwise but you need an impact gun that has a good torque does not come out otherwise. Thanks

Mar 24, 2010 | 1994 Honda Accord

1 Answer

I have a Bosch 11236vs and the hammer function does not seem to work properly. The tools move in and out but don't have any impact if you hold them. Dissassembled and everything looks fine, but when I...


Most of the time the o-ring on the striker needs changed. Look closely at the hammer piston as well, once in a while (very rare) the piston will develop a crack that allows air to escape by the striker, keeping it from striking the impact bolt. Make sure to add a little extra grease when going back together as well.

Oct 18, 2009 | Bosch Drills

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