I might have bent my valves d16y7
11-04-2011, 06:01 AM
#1
Honda-Tech Member
Thread Starter
I might have bent my valves d16y7
I wasn't thinking I'm putting my d16y7 head on and I turned the crank pulley when the timing belt wasn't on the cam gear you think I bent them?
11-04-2011, 06:07 AM
#3
Re: I might have bent my valves d16y7
The timing belt has to be on the cam gear in order for the valves to move. It depends on what position the head was in when you mated it to the block. Pull the head back off and make sure, this isn't something you want to guess at. Make sure everything is at TDC or else you WILL bend your valves.
11-04-2011, 06:31 AM
#5
Honda-Tech Member
Thread Starter
Re: I might have bent my valves d16y7
How can I tell?? Will it be enough of a bent that I'll see it And is it a big deal to take the valves off? And put new in
11-04-2011, 07:20 AM
#7
Re: I might have bent my valves d16y7
Not if you have a spring compressor. I have seen people use zip-ties to compress the valve springs to take the keepers off. Look at the piston for scratch marks. If the valve is bent, it will not seat properly.
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11-04-2011, 07:25 AM
#8
Re: I might have bent my valves d16y7
The timing belt has to be on the cam gear in order for the valves to move. It depends on what position the head was in when you mated it to the block. Pull the head back off and make sure, this isn't something you want to guess at. Make sure everything is at TDC or else you WILL bend your valves.
11-04-2011, 07:34 AM
#9
Honda-Tech Member
Thread Starter
Re: I might have bent my valves d16y7
I'm saying I turned the crank Pully when the belt wasn't ont the cam so would the pistons bend the valves when they came up? I want a whole cycle thru on the crank pully
11-04-2011, 07:45 AM
#10
11-04-2011, 08:20 AM
#13
Re: I might have bent my valves d16y7
You have to options really. 1 would be to pull everything off and check. 2. Would be to cross your fingers and run a compression test. I would personally go for 2 but thats just me.
11-04-2011, 08:32 AM
#15
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Re: I might have bent my valves d16y7
The intake and exhaust manifold is off ATM just sitting on with the studs in it would take 10 mins to get it back off and I have some extra used valves now what's the best choice
11-04-2011, 08:37 AM
#17
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Re: I might have bent my valves d16y7
Personally I'd do the compression check. If it's good, it'll save you a head gasket.
EDIT: RonJ@HT beat me to it about not needing the manifolds
and nice new cat picture
11-04-2011, 08:55 AM
#21
Re: I might have bent my valves d16y7
https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/faqs-frequently-asked-tech-questions-1998336/
Frequently Asked Questions.
Frequently Asked Questions.
11-04-2011, 09:55 AM
#22
Honda-Tech Member
Re: I might have bent my valves d16y7
When I had my last engine rebuilt the shop informed me that I had one slightly bent valve. They replaced it at a cost of ~$13 for the part. I asked if it was possible I bent the valve when hoisting the engine engine on/off the stand they said no it had been running that way. My compression was ok when I tested it shortly before the engine removal. The engine was removed because I had a very slight head gasket leak. Compression gasses were leaking into my radiator enough to cause coolant loss over time. The engine had over 200k hard miles on it so I opted for a rebuild and swapped in my spare engine.
Point being - engine can run and have acceptable compression with at least one slightly bent valve.
Caveat - the valve may have been warped/bent by the headgasket problem? I never saw any white smoke or oil contamination which leads me to believe the headgasket was only leaking gasses out and not coolant in (compressed/combusting gas leaks easier than vacuumed liquid?).
Point being - engine can run and have acceptable compression with at least one slightly bent valve.
Caveat - the valve may have been warped/bent by the headgasket problem? I never saw any white smoke or oil contamination which leads me to believe the headgasket was only leaking gasses out and not coolant in (compressed/combusting gas leaks easier than vacuumed liquid?).
11-04-2011, 09:58 AM
#23
Re: I might have bent my valves d16y7
Point being - engine can run and have acceptable compression with at least one slightly bent valve.
Caveat - the valve may have been warped/bent by the headgasket problem? I never saw any white smoke or oil contamination which leads me to believe the headgasket was only leaking gasses out and not coolant in (compressed/combusting gas leaks easier than vacuumed liquid?).
A valve hit by the piston, however, would invariably show compression loss.
11-04-2011, 02:25 PM
#25
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Re: I might have bent my valves d16y7
If you're pulling off the head, spray brake cleaner into each port (ports facing up so that the liquid creates a pool inside of the port with the valves closed). If it leaks into the combustion chamber you have a leak. If it's damp, it's so so. If it's not wet, you have no leak (rough estimation of course).