Watch The
Repair Video

Cover, Head

Part Number: 12311-Z8B-000

Ships within 1 business day

Questions & Answers

Repair Instructions

Product Information

Manufacturer: Honda

Product Number: 12311-Z8B-000

Classification: Part

Weight: 0.25 lbs.

Shipping: Ships Worldwide

Warning: California's Proposition 65

Compatibility

This part is compatible with the following machines:

Honda

Expand the 44 compatible machines

Products Compatibility

This item works with the following types of products:

• Lawn Mower

Questions & Answers

Sort by

I didn't see a gasket between the valve cover and the head? Are they just putting Permatex in-between?

chad for model number gcv190la s3l nh1 asked on 2019-06-06

Hello Chad, thank you for your question. Yes, there is no gasket between the cover and head. Other customers indicated that they used sealant on the new valve cover which was recommended by others. I hope this helps!

1 person found this helpful.

Did this question help you?

Repair Instructions: Submitted by Customers Like You

Tool Type:

Lawn Mower

Parts Used:

Valve Rocker Arm - 14431-Z0J-000

Valve Rocker Arm - 14441-Z0J-000

O-Ring - 6.8X1.9 - Arai - 91301-ZM0-V31

Seal- Valve Stem - 12209-ZM0-003

Spring- Valve - 14751-ZL8-000

Valve, In. - 14711-ZL8-000

Pulley, Camshaft - 14320-Z8D-000

Belt, Timing (84Hu6 G-200) - 14400-Z8B-003

Valve, Ex. (C8E) - 14721-ZL8-000

Cover, Head - 12311-Z8B-000

Repair Difficulty:

Hard

Time Spent Repairing:

More than 2 hours

Tools Used:

Screwdriver, Pliers, Socket set, Wrench Set, 2 and 3 jaw pullers, low and high range torque wrenches

Bent crankshaft due to hitting very hard object

1. Took off broken blades, blade holder and drive belt pulley. This required a two jaw puller due to bend in shaft.
2. Open up crankcase. Many steps involved. Followed youtube videos. Detailed videos exist.
3. Take out piston. Found lots of black soot on piston, crankcase and valve seats. Apparently due to mistiming from running engine with bent crankshaft since this is a pretty new engine always running smooth before accident.
4. Use carburetor cleaner and lots of work to clean piston and case. Put in new valves and use grinding compound to clean valve seats and "break in" valves.
5. Install new crankshaft (also from ereplacement) and all new parts related to timing. The old ones looked fine but did not want to have to open up again in case there was some damage not visible.
6. Assemble everything. Again lots of steps. Take pictures when disassembling, label parts and use youtube videos. A mechanic friend lent me a puller and a torque wrench.
7. New blade holder and blades.
8. Pull starter cord. Starts right off. Runs very smooth. Cuts very well. Success but it is a major project for amateurs. I am retired thus have the time and love this Honda lawnmower. Kind of expensive because of all the new parts but still cheaper than a new Honda and I have only had it a couple of years. Now it's practically new.

Did you find this story helpful?

Thanks for voting and helping fellow customers!