Skip the auto shop - Our mechanics make house calls

Q: Motor rebuild. Loss of power when driving. Knock coming from top end.

asked by on

My father had the motor rebuilt in this ranger by a friend/mechanic. The head/valve train was not refreshed however. I believe the timing chain was replaced. When he was driving it home the truck lost power and had to be towed. It sit for a year after that. He gave the truck to me so I started working on it. I had to replace the fuel pump to get it started. The truck started and idled fine. Once it got warm I heard a knock in the top end of the motor. After talking to the mechanic who rebuilt the motor he suggested it was something to do with lash adjusters. He is not capable of fixing the truck at the moment and I can not afford a traditional mechanic. Where should I start on the diagnosis/repair of this issue? Any suggestions or help would be greatly appreciated!

My car has 200000 miles.
My car has a manual transmission.

A: Hey there. The valve tappets are under the ...

Hey there. The valve tappets are under the camshafts, and in order to replace the bad ones, or ones that need clearance adjustments by replacing lash adjuster, you would need to have camshafts removed. This is a major job to only be performed by a qualified mechanic or severe engine damage may happen if not done correctly. Depending on how badly you need to get the car running, your best bet may be to have another mobile mechanic diagnose the vehicle’s loss of power in person to advise you on any repairs that need to be made.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Whining whistling in TBI area

Hello. I believe that you are experiencing a problem with the idle air control valve. It probably has built up some carbon. When the engine warms up it requires less air at idle so this valve closes a little more...

Q: severe steering wheel vibration at speeds above 60 mph, but not below 60, and severe vibration during braking.

If you can wiggle the tire side to side then you either have a problem with inner or outer tie rod ends. You may have both of them that are bad. This will allow the side-to-side movement, but brake rotors...

Q: Wipers freezing on interval mode?

Hi there: What you've described is possibly caused by a worn out wiper motor or the wiper motor relay switch that has an electrical fault. The best way to know for certain and to reduce cost for unnecessary repairs, contact...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.